Complex sentence: The earthquake bomb also used the concept of an explosion in a dense medium They differ somewhat in concept from traditional aircraft-borne bombs, which usually explode at or near the surface, and destroy their target directly by explosive force.
Split into simpler sentences: The earthquake bomb also used the concept of an explosion in a dense medium. It differed somewhat in concept from traditional aircraft-borne bombs, which usually explode at or near the surface, and destroy their target directly by explosive force.