Complex sentence: As Deanie leaves with her friends, Bud only seems partially satisfied by the direction his life has taken, and he takes the moment to reassure Angelina, who he notices has realized that Deanie was once the love of Bud's life.
Split into simpler sentences: As Deanie leaves with her friends, Bud only seems partially satisfied by the direction his life has taken. After the others are gone, he reassures Angelina, who has realized that Deanie was once the love of Bud's life.