Complex sentence: The cruiser took part in the bombardment of the Japanese airbases on Sakishima Gunto between 15--20 April before the fleet was tasked to Leyte Gulf.
Split into simpler sentences: The cruiser took part in the bombardment of the Japanese airbases on Sakishima Gunto. The islands were attacked between 15--20 April before the fleet was tasked to Leyte Gulf.