Complex sentence: Several amalgamations later and construction was started in October 1851 with the Thirsk and Malton (T & M) line opening in 1853 under the York, Newcastle and Berwick Railway.
Split into simpler sentences: Several amalgamations later and construction was started in October 1851. The Thirsk and Malton (T & M) line was opened in 1853 under the York, Newcastle and Berwick Railway.