Complex sentence: The Norfolk Railway, building its line from Wymondham, reached Dereham first, and opened its railway to passengers on the 15 February 1847; the line from King's Lynn had to wait until 11 September 1848.
Split into simpler sentences: The Norfolk Railway, building its line from Wymondham, reached Dereham first, and opened its railway to passengers on the 15 February 1847. The line from King's Lynn had to wait until 11 September 1848.