How to break records from a single line of multiple records? VB.Net or C#

I have a file with multiple records entered on a single line without a record breaker as follows.

AAABUS6666666   01  AAAB,INC.                1105070522AAABUS9147930   21  0008060362Smith       John       540 N.VIA VALVERDEAAABUS7777777   01  AAAB,INC.                1105070522AAABUS9147930   21  0008060362Carillo       Dave       201 Verdugo AveAAABUS8888888   01  AAAB,INC.                1105070522AAABUS9147930   21  0008060362Stevenson       Craig       540 N.VIA VALVERDE




I would like to break these records with a ; or any special character
Please advise how can this be accomplished in VB.Net.

The only thing that is unique and can indicate a record breaker is "01  AAAB,INC."  

Each record is not fixed length.
AAABUS is repeated twice on each line.

After processing, the final output should look like(Please note the ; and line break):
AAABUS6666666   01  AAAB,INC.                1105070522AAABUS9147930   21  0008060362Smith       John       540 N.VIA VALVERDE;
AAABUS7777777   01  AAAB,INC.                1105070522AAABUS9147930   21  0008060362Carillo       Dave       201 Verdugo Ave;
AAABUS8888888   01  AAAB,INC.                1105070522AAABUS9147930   21  0008060362Stevenson       Craig       600 N.Hollywood;

Thanks.