Complex sentence: When Lila (Jeannie Berlin, daughter of director, Elaine May), is severely sunburned, Lenny quarantines her to their hotel room as he begins to rendezvous with Kelly, lying to Lila about his whereabouts.
Split into simpler sentences: When Lila (Jeannie Berlin, daughter of director, Elaine May), is severely sunburned, she is quarantined to their hotel room. Lenny begins to rendezvous with Kelly, lying to Lila about his whereabouts.