Complex sentence: For the opening of the 6.6 km long railway line from Doberan to Heiligendamm the DHE had procured two'tramway' locomotives, which were given the numbers 1 and 2.
Split into simpler sentences: For the opening of the 6.6 km long railway line from Doberan to Heiligendamm the DHE had procured two "tramway" locomotives. The locomotives were given the numbers 1 and 2.