Complex sentence: In 1846 the Newcastle & Darlington Junction Railway was renamed the York & Newcastle Railway, the following year the Newcastle & Berwick Railway opened a railway to Berwick and a few weeks later merged with the York & Newcastle to form the York, Newcastle and Berwick Railway.
Split into simpler sentences: In 1846 the Newcastle & Darlington Junction Railway was renamed the York & Newcastle Railway. In 1847 Newcastle & Berwick Railway opened a railway to Berwick and a few weeks later merged with the York & Newcastle to form the York, Newcastle and Berwick Railway.