Complex sentence: As is suggested by its name, the River Trym passes through Westbury on Trym: the name of the river was added to the place name because there are several places called Westbury in England.
Split into simpler sentences: As is suggested by its name, the River Trym passes through Westbury on Trym. The name of the river was added to the place name because there are several places called Westbury in England.