Complex sentence: Tragedy struck "Marblehead" on 17 November 1942, while hoisting her whaleboat back aboard, one of the sailors from the landing party fell overboard and never resurfaced.
Split into simpler sentences: Tragedy struck "Marblehead" on 17 November 1942. While hoisting her whaleboat carrying a landing party back aboard, one of the sailors fell overboard and never resurfaced.