Complex sentence: Following Federation all the state defence forces were combined into the Australian Army, all senior units were numbered 1 to 12 and the First Queenslanders became The 9th Australian Infantry Regiment (9 AIR).
Split into simpler sentences: Following Federation all the state defence forces were combined into the Australian Army, and all senior units were numbered 1 to 12. As a result, The First Queenslanders became the 9th Australian Infantry Regiment (9 AIR).