Complex sentence: During the fighting, Seabees worked on creating an airstrip that would later house B 24 Liberator bombers of the 494th Bomb Group, 7th Air Force, that did frequent bombings of the Philippines and other Palau Islands.
Split into simpler sentences: During the fighting, Seabees created an airstrip that would house B 24 Liberator bombers of the 494th Bomb Group, 7th Air Force. The group engaged in frequent bombings of the Philippines and other Palau Islands.