Original sentence: Cwm Cynon Colliery - Bugun in 1889.Penrhiwceibr Colliery  - Begun in 1872 by a Mr.Thomas of Cwmbach, at one point in 1923 there were over 2200 employees,  but Penrhiwceiber Colliery closed on 8 October 1985
Edited sentence: But sadly, Penrhiwceiber Colliery closed on 8 October 1985, spanning more than a century.Cwm Cynon Colliery - Which began in 1889.Penrhiwceibr Colliery  - Which sank in 1872 by a Mr.Thomas of Cwmbach, at one point in 1923 there were over 2200 employees