Complex sentence: The 2/23rd Battalion struck north from Masangkoo, moving towards Fior, with the task for finding a river crossing for the brigade; at the same time the 2/24th set out from Palanko in search of jungle tracks towards the river.
Split into simpler sentences: The 2/23rd Battalion struck north from Masangkoo, moving towards Fior, with the task for finding a river crossing for the brigade. At the same time the 2/24th set out from Palanko in search of jungle tracks towards the river.