Complex sentence: The Turks never succeded in driving the Australians and New Zealanders back into the sea, and he ANZACs never broke out of their beachhead, December 1915, after eight months of fighting they evacuated the peninsula.
Split into simpler sentences: The Turks never succeeded in driving the Australians and New Zealanders back into the sea. Similarly the ANZACs never broke out of their beachhead, instead in December 1915, after eight months of fighting they evacuated the peninsula.