DSXchange

I havent tried it out but this should work;

Create 3 sequences:

Main Sequence :
SeqA->SeqB

SeqA:
A1->A
A1.Do not CheckPoint run= true

SeqB:
B1->B
B1.Do not CheckPoint run= true

IHTH

Having a sequencer in a sequencer works. I have already tried that out. but isn't there a simpler solution (one that involves a single sequencer)?

Not if you have "do not checkpoint run" set for A1. You're asking to have your cake and eat it too.