Complex sentence: Along with Tunnel Creek and Windjana Gorge, Geikie Gorge is part of an ancient barrier reef that developed during the Devonian Period and the walls of the gorge are 30 metres high.
Split into simpler sentences: Along with Tunnel Creek and Windjana Gorge, Geikie Gorge is part of an ancient barrier reef that developed during the Devonian Period. The walls of the gorge are 30 metres high.