Complex sentence: Later a two-battalion attack on A, B and C Companies was also turned back, while a counterattack by elements of A Company with APCs in support regained the lost 3 Platoon section post.
Split into simpler sentences: Later a two-battalion attack on A, B and C Companies was also turned back. The Austrlaians then counter-attacked with elements of A Company supported by APCs regaining the lost 3 Platoon section post.