Complex sentence: During their high school years as they have one last blowout in Bill's honor as he's being shipped off a drunken Hank stirs up a fight with a thug at a bar, but Bill intervenes and saves Hank.
Split into simpler sentences: During their high school years as they have one last blowout in Bill's honor as he's being shipped off. But a drunken Hank stirs up a fight with a thug at a bar, Bill intercepts the fight and saves Hank.