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Consider this multi-sample VCF input record at chromosome 1 position 100. It lists four samples with their genotypes being; homozygous reference [AA/AA], heterozygous SNP [AA/AT], heterozygous insertion [AT/AAC] and heterozygous deletion [AA/A]: 

#CHROM POS    REF    ALT       FORMAT  SAMPLE1       SAMPLE2        SAMPLE3        SAMPLE4
1      100    AA     AT,AAC,A  AT:AD   0/0:40,1,0,0  0/1:19,20,1,0  2/1:0:20,22,0  0/3:19,0,0,20

The OpenCB Variant Normalization process normalises this first splits the record into four individual variants. The ; 

#CHROM POS    REF    ALT       
1      100    AA     AT
1      100    AA     AAC
1      100    AA     A

Each variant is then allele trimmed and positions updated;

#CHROM POS    REF    ALT       
1      101    A      T
1      102    -      C
1      100    A      -

The final JSON representation of the Variant objects as stored in the OpenCGA database is as follows:

{
  "id" : "1:
100
101:A:
-
T",
  "chromosome" : "1",
  "start" :
100
101,
  "end" :
100
101,
  "reference" : "A",
  "alternate" : "T",
  "type" : "
INDEL
SNV",
  "studies" : [ {
    "files" : [ {
      "call" : {
        "variantId" : "1:100:AA:AT,AAC,A",
        "alleleIndex" :
2
0
      }
    } ],
    "secondaryAlternates" : [ {
      "chromosome" : "1",
      "start" :
101
102,
      "end" : 101,
      "reference" : "
A
",
      "alternate" : "
T
C",
      "type" : "
SNV
INDEL"
    }, {
      "chromosome" : "1",
      "start" :
102
100,
      "end" :
101
100,
      "reference" : "A",
      "alternate" : "
C
",
      "type" : "INDEL"
    } ],
    "sampleDataKeys" : [ "GT", "AD" ],
    "samples" : [ {
      "sampleId" : "SAMPLE1",
      "data" : [ "0/0", "40,1,0,
1,
0" ]
    }, {
      "sampleId" : "SAMPLE2",
      "data" : [ "0/
2
1", "19,
0,
20,1,0" ]
    }, {
      "sampleId" : "SAMPLE3",
      "data" : [ "
3
2/
2
1", "0:20,22,0,
22,
0" ]
    }, {
      "sampleId" : "SAMPLE4",
      "data" : [ "0/
1
3", "19,
20
0,0,
0
20" ]
    } ]
  } ]
}
{
  "id" : "1:
101
102:
A
-:
T
C",
  "chromosome" : "1",
  "start" :
101
102,
  "end" : 101
,
"reference" : "A"
,
  "alternate" : "
T
C",
  "type" : "
SNV
INDEL",
  "studies" : [ {
    "files" : [ {
      "call" : {
        "variantId" : "1:100:AA:AT,AAC,A",
        "alleleIndex" :
0
1
      }
    } ],
    "secondaryAlternates" : [ {
      "chromosome" : "1",
      "start" :
102
101,
      "end" : 101,
      "reference" : "A",
      "alternate" : "
C
T",
      "type" : "
INDEL
SNV"
    }, {
      "chromosome" : "1",
      "start" : 100,
      "end" : 100,
      "reference" : "A",
      "alternate" : "",
      "type" : "INDEL"
    } ],
    "sampleDataKeys" : [ "GT", "AD" ],
    "samples" : [ {
      "sampleId" : "SAMPLE1",
      "data" : [ "0/0", "40,0,1
,0
,0" ]
    }, {
      "sampleId" : "SAMPLE2",
      "data" : [ "0/
1
2", "19,1,20
,1
,0" ]
    }, {
      "sampleId" : "SAMPLE3",
      "data" : [ "1/2
/1
", "0:20,0,22,0
,0
" ]
    }, {
      "sampleId" : "SAMPLE4",
      "data" : [ "0/3", "19,0,0,20" ]
    } ]
  } ]
}
{
  "id" : "1:
102
100:A:-
:C
",
  "chromosome" : "1",
  "start" :
102
100,
  "end" : 101,
  "reference" : "A",
  "alternate" : "
C
",
  "type" : "INDEL",
  "studies" : [ {
    "files" : [ {
      "call" : {
        "variantId" : "1:100:AA:AT,AAC,A",
        "alleleIndex" :
1
2
      }
    } ],
    "secondaryAlternates" : [ {
      "chromosome" : "1",
      "start" : 101,
      "end" : 101,
      "reference" : "A",
      "alternate" : "T",
      "type" : "SNV"
    }, {
      "chromosome" : "1",
      "start" :
100
102,
      "end" :
100
101,
      "reference" : "
A
",
      "alternate" : "C",
      "type" : "INDEL"
    } ],
    "sampleDataKeys" : [ "GT", "AD" ],
    "samples" : [ {
      "sampleId" : "SAMPLE1",
      "data" : [ "0/0", "40,0,1,0" ]
    }, {
      "sampleId" : "SAMPLE2",
      "data" : [ "0/2", "19,
1
0,20,
0
1" ]
    }, {
      "sampleId" : "SAMPLE3",
      "data" : [ "
1
3/2", "0:20,0,22,0" ]
    }, {
      "sampleId" : "SAMPLE4",
      "data" : [ "0/
3
1", "19,20,0,0
,20
" ]
    } ]
  } ]
}