Complex sentence: Don helps a bit by puting abunch of cans all around for Nathan to find.When he gets enough money he goes to the department store where he saw the shoes and buys them but at the counter the cashier tells him he doesn't have enough money.
Split into simpler sentences: Don helps a bit by puting abunch of cans all around for Nathan to find. Meanwhile When Nathan gets enough money he goes to the department store where he saw the shoes and buys them but at the counter the cashier tells him he doesn't have enough money.