Complex sentence: Journeying along the line you came to Whitebrook Halt, then Penallt Halt, Redbrook Station and finally Monmouth Troy Station which was opened by the Coleford, Monmouth, Usk & Pontypool Railway.
Split into simpler sentences: Journeying along the line you then came to Whitebrook Halt, then Penallt Halt, Redbrook Station and finally Monmouth Troy Station. This station was opened by the Coleford, Monmouth, Usk & Pontypool Railway.