Complex sentence: The evening before the fight Mailer has a beer with George Plimpton who covers the fight for "Sports Illustrated", attends the press meeting of Foreman at the Hotel Memling, and then Plimpton and he set out for Ali's place to join his retinue.
Split into simpler sentences: The evening before the fight Mailer has a beer with George Plimpton who covers the fight for "Sports Illustrated" before attending the press meeting of Foreman at the Hotel Memling. Then Plimpton and he set out for Ali's place to join his retinue.