Complex sentence: However, later consolidation within the pit and mining complex eventually connected all nine of the mines, and hence the whole development was called Ferndale Colliery from the completion of No.9 in 1907 by Davies's Ocean Colliery Company onwards.
Split into simpler sentences: However, later consolidation within the areas mining and pit complex eventually connected all nine of the mines. Hence the whole development was called Ferndale Colliery, from the completion of No.9 in 1907 by Davies's Ocean Colliery Company onwards.