Complex sentence: In 1845 it became the St Helens Canal and Railway when it amalgamated with the Sankey Brook Navigation by 1854 the entire concern was know as the St Helens Railway.
Split into simpler sentences: In 1845 it became the St Helens Canal and Railway when it amalgamated with the Sankey Brook Navigation. By 1854 the entire concern was known as the St Helens Railway.