Complex sentence: The Japanese occupied it on 3 May 1942, with the intention of setting up a seaplane base nearby, and the ships in Tulagi harbor were raided by planes from USS "Yorktown" the following day, in a prelude to the Battle of the Coral Sea.
Split into simpler sentences: The Japanese occupied it on 3 May 1942, with the intention of setting up a seaplane base nearby. The ships in Tulagi harbor were raided by planes from USS "Yorktown" the following day in a prelude to the Battle of the Coral Sea.