Complex sentence: The line remained closed in 1923, when the Highland Railway was absorbed by the London, Midland and Scottish Railway (LMS) and the track relaid, but services were not restarted and the track removed again.
Split into simpler sentences: The line remained closed in 1923, when the Highland Railway was absorbed by the London, Midland and Scottish Railway (LMS). The track was relaid, but services were not restarted and the track removed again.