text: The baleen whales , also called whalebone whales or great whales , form the Mysticeti , one of two suborders of the Cetacea ( whales , dolphins , and porpoises ) .
simplified: The baleen whales , also called whalebone whales or great whales , make up the Mysticeti , one of the two groups of the Cetacea ( whales , dolphins , and porpoises ) .