Complex sentence: Bonvin married a laundress at the age of twenty, at about the same time that two other events occurred: he got a job at the headquarters of the Paris police, and he contracted an illness which would trouble him for the rest of his life.
Split into simpler sentences: Bonvin married a laundress at the age of twenty, at about the same time that he secured a job at the headquarters of the Paris police. It was during this period in his life that he also contracted an illness which would trouble him for the rest of his life.