Complex sentence: Erected around 4700 BC, at the same time as another 18 blocks nearby, it was deliberately toppled at around 4000 BC. The monument is the largest known single block of stone to have been transported and erected by Neolithic man.
Split into simpler sentences: Erected around 4700 BC, at the same time as another 18 blocks nearby. It was deliberately toppled at around 4000 BC. The monument is the largest known single block of stone to have been transported and erected by Neolithic man.