How to combine nested lists

Hello everyone i have two lists which i need to attach back together, however when i try to do this all my lists get split up, how can i combine them back together such that the list level is as follows:

0 - 
 0 -
  2 items
 1 - 
  2 items
(etc)

1 - 
 0 -
  2 items

Instead of 1 item per list even though their list levels match:

what about flatten?

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Awesome @Vikram_Subbaiah,

Thank you very much for your solution !

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