Complex sentence: Furthermore, with island bases n the area, the Japanese hoped to launch at distance, have their aircraft attack the US fleet and then land on island airfields, allowing them to shuttle back and attack again on the return flight.
Split into simpler sentences: Furthermore, with island bases in the area, the Japanese hoped to launch at distance, have their aircraft attack the US fleet and then land on island airfields. They then could shuttle back and attack again on the return flight.