Complex sentence: Pool competency is a module to test the divers'water confidence as well as the ability to keep calm under hectic situations, there are 3 parts to pool competency but is mainly being' attacked under water.
Split into simpler sentences: Pool competency is a module to test the divers'water confidence, as well as their ability to keep calm under hectic situations. There are 3 parts to pool competency but is mainly being' attacked under water.