Complex sentence: He graduated from high school in 1962 and spent two years in the United States Navy serving on the USS Hornet, after which he held a series of jobs ranging from a janitor to an insurance salesman.
Split into simpler sentences: He graduated from high school in 1962 and spent two years in the United States Navy, serving on the USS Hornet. After that, he held a series of jobs ranging from a janitor to an insurance salesman.