Complex sentence: He had to give up this dream when he left high school to enter the workforce--his uncle got him a job on a loading dock after World War II, and by the 1970s he was a foreman.
Split into simpler sentences: He had to give up this dream when he left high school to enter the workforce. His uncle got him a job on a loading dock after World War II, and by the 1970s he was a foreman.