Complex sentence: Australia was ill-prepared to counter such an attack as the Royal Australian Air Force (RAAF) lacked modern aircraft and the Royal Australian Navy (RAN) was too small and unbalanced to counter the Imperial Japanese Navy.
Split into simpler sentences: Australia was ill-prepared to counter such an attack. The Royal Australian Air Force (RAAF) lacked modern aircraft and the Royal Australian Navy (RAN) was too small and unbalanced to counter the Imperial Japanese Navy.