Complex sentence: It was built between 1177 and 1185, with an original length of some 900 m (2950 ft), but it suffered frequent collapses during floods and had to be reconstructed several times.
Split into simpler sentences: It was built between 1177 and 1185, with an original length of some 900 m (2950 ft). The bridge suffered frequent collapses during floods and had to be reconstructed several times.