Complex sentence: There is a U.S. Geological Survey stream gauge, station number 03439000, on the French Broad River in Rosman, whilst the climate is very wet, with a mean annual rainfall since 1936 of, one of the highest in the US east of the Cascades.
Split into simpler sentences: There is a U.S. Geological Survey stream gauge, station number 03439000, on the French Broad River in Rosman. The climate is very wet, with a mean annual rainfall since 1936 of--one of the highest in the US east of the Cascades.