Complex sentence: The forward observer then called in further mortar and artillery fire, with and rounds slamming into the Indonesian positions, and by 1345 the Australian platoon was able to begin to withdraw back to its firm base, carrying one of their wounded with them.
Split into simpler sentences: The forward observer then called in further mortar and artillery fire, with and rounds slamming into the Indonesian positions. By 1345 the Australian platoon began withdrawing back to its firm base, carrying one of their wounded with them.