Complex sentence: CASA licences pilots, ground crew, aircraft and airfield operators; and is responsible for enforcing safety requirements under the Commonwealth "Civil Aviation Act 1988" and the "Air Navigation Act 1920".
Split into simpler sentences: CASA licences pilots, ground crew, aircraft and airfield operators. It is also responsible for enforcing safety requirements under the Commonwealth "Civil Aviation Act 1988" and the "Air Navigation Act 1920".