Complex sentence: These boats were to be twice as large as any existing U-boat and were to ahve had a crew of 110 while carrying a single Arado Ar 231 floatplane, but were canceled at the outbreak of war later that year.
Split into simpler sentences: These boats were to be twice as large as any existing U-boat and have a crew of 110. They were intended to carry a single Arado Ar 231 aircraft, but were canceled at the outbreak of war later that year.