Complex sentence: Unlike the bridge downstream at Caerleon, it withstood the great floods of 1795, and the bridge was strengthened and widened in 1836, but two of its arches were destroyed by floods in 1877 and later replaced.
Split into simpler sentences: Unlike the bridge downstream at Caerleon, it withstood the great floods of 1795. The bridge was strengthened and widened in 1836, but two of its arches were destroyed by floods in 1877 and later replaced.