Complex sentence: Discovered in 1543 by Spanish sailor Bernardo de la Torre, before World War II Iwo Jima was administered as Iōjima village and was (as it is today) part of Tokyo.
Split into simpler sentences: Discovered in 1543 by Spanish sailor Bernardo de la Torre. Before World War II, Iwo Jima was administered as Iōjima village and was (as it is today) part of Tokyo.