Complex sentence: The 494 landed 378 men of the U.S. Army`s 26th Infantry Regiment (known as the Blue Spaders from their distinctive spad-shaped regimental emblem) of the 1st Infantry Division ("The Big Red One").
Split into simpler sentences: The 494 landed 378 men of the U.S. Army`s 26th Infantry Regiment (known as the Blue Spaders from their distinctive spad-shaped regimental emblem). The 26th Regiment was part of the 1st Infantry Division ("The Big Red One").