Complex sentence: They also ran pizza shops in Philadelphia and Camden, and, with a cousin, pizzerias as far south as Dover, Del. Rosario and Joseph were also suspects in a string of arsons in the 1980s.
Split into simpler sentences: They also ran pizza shops in Philadelphia and Camden, and, with a cousin, pizzerias as far south as Dover, Delaware. The two brothers were also suspects in a string of arsons in the 1980s.