Complex sentence: Michael (Wentworth Miller) realizes that to complete the digging job inside the walls, he needs to spend a good block of time there, which has been proving difficult as he has to keep coming back to his cell to make count.
Split into simpler sentences: Michael (Wentworth Miller) realizes that to complete the digging job inside the walls, he needs to spend a good block of time in there. This is proving difficult as he has to keep coming back to his cell to make count.