Complex sentence: Couridjah was formerly a station on the Main Southern Railway, until that line was deviated in 1919 to a less steep alignment with easier grades, and the original line became the Picton Loop line.
Split into simpler sentences: Couridjah was formerly a station on the Main Southern Railway. That line was deviated in 1919 to a less steep alignment with easier grades, and the original line became the Picton Loop line.