Complex sentence: For extra money he manufactured nitroglycerin in their home, constructing a home laboratory on their front porch, and at one point he pawned Helen's engagement ring and would often ask her family for loans.
Split into simpler sentences: For extra money he manufactured nitroglycerin in their home, constructing a home laboratory on their front porch. At one point he pawned Helen's engagement ring, and he often asked her family for loans.