Complex sentence: Billingsley welcomed young people who were not old enough to drink, he encouraged them to gather at the Stork Club by inviting debutantes to the club and holding a yearly "Glamor Girl" election.
Split into simpler sentences: Billingsley welcomed young people who were not old enough to drink. He encouraged them to gather at the Stork Club by inviting debutantes to the club and holding a yearly "Glamor Girl" election.