Complex sentence: The site was excavated by Geoff Wainwight in 1969; he excavated the north entrance and found a timber circle, and Grooved ware pottery, similar to Durrington Walls.
Split into simpler sentences: The site was excavated by Geoff Wainwight in 1969. He excavated the North entrance, and found a timber circle, and Grooved Ware pottery, similar to Durrington Walls.