Complex sentence: The defences at Atawineh, Sausage Ridge, Hareira, and at Teiaha supported each other, as they overlooked an almost flat plain making a frontal attack against them virtually impossible.
Split into simpler sentences: The defences at Atawineh, Sausage Ridge, Hareira, and Teiaha supported each other. As they overlooked an almost flat plain, making a frontal attack against them virtually impossible.