Complex sentence: In 1963, a U.S. Navy destroyer is on a routine patrol off Guadalcanal when sonar picks up the sound of metallic clanging beneath the waves; the crew speculates that it sounds like a hammer.
Split into simpler sentences: In 1963, a U.S. Navy destroyer is on a routine patrol just off Guadalcanal when sonar picks up the sound of metallic clanging beneath the waves. The crew speculates that it sounds like a hammer.