Complex sentence: Lily Tomlin is the difficult, eccentric, spoiled rotten, but oxygen-dependent millionairess named Edwina Cutwater who, on discovering that she is dying, wants to make some unusual final arrangements.
Split into simpler sentences: Lily Tomlin is a difficult, eccentric, spoiled rotten, but oxygen-dependent millionairess named Edwina Cutwater. Discovering that she is dying, Cutwater wants to make some unusual final arrangements.