Complex sentence: Back in Toronto, Ben was a dutiful son and entered into the family business-starting at the bottom and doing a bit of every job in the factory and stores, but he longed to return to Palestine and his great adventure.
Split into simpler sentences: Back in Toronto, Ben was a dutiful son and entered into the family business-starting at the bottom and doing a bit of every job in the factory and stores. But he longed to return to Palestine and his great adventure.