Complex sentence: By the spring of 1939 Beeson and his classmates hung out at Tillotson's in Boise after school, they could eat burgers, drink malted milk shakes and listen to big band records on the juke box.
Split into simpler sentences: By the spring of 1939 Beeson and his classmates hung out at Tillotson's in Boise after school. There they would eat burgers, drink malted milk shakes and listen to big band records on the juke box.