Complex sentence: The Hogsmill River in the English county of Surrey is one of the tributaries of the River Thames; it rises in Ewell and flows into the Thames at Kingston upon Thames on the reach above Kingston road bridge.
Split into simpler sentences: The Hogsmill River in Surrey, England, is one of the tributaries of the River Thames. It rises in Ewell and flows into the Thames at Kingston upon Thames on the reach above Kingston road bridge.