Complex sentence: When a person dies, the casket is carried by a hearse, usually the first cars after the hearse are limousine or limousines which carry the deceased family members and pallbearers.
Split into simpler sentences: When a person dies, the casket is carried by a hearse. Usually, the first cars after the hearse are a limousine or limousines that carry the deceased's family members and pallbearers.