Complex sentence: The River Beane originates from the hills around Stevenage in Hertfordshire and flows through Walkern, Watton-at-Stone, Stapleford and Waterford until it reaches the River Lee at Hartham Common in Hertford.
Split into simpler sentences: The River Beane originates from the hills around Stevenage in Hertfordshire. It flows from Watton-at-Stone, Stapleford and Waterford until it reaches the River Lee at Hartham Common in Hertford.