Complex sentence: However, if the sightings of tropical beaked whales are taken into account, the range of this whale is more extensive; they have been sighted from the Arabian Sea to the western shore of Mexico.
Split into simpler sentences: However, if the sightings of the Tropical Beaked Whale are taken into account, the range of this whale is extensively larger. They have been sighted from the Arabian Sea to the western shore of Mexico.