Complex sentence: The railway line between Hanover and Lehrte via Peine was built in 1843 and extended in the following years to Brunswick with branch lines were built from Lehrte to Celle (1845) and to Hildesheim (1846).
Split into simpler sentences: The railway line between Hanover and Lehrte via Peine was built in 1843 and extended in the following years to Brunswick. Branch lines were subsequently built from Lehrte to Celle (1845) and to Hildesheim (1846).