Complex sentence: It is named from the valley of the Ebbsfleet River, which it straddles, with the eastern part of the site in the borough of Gravesham and with the portion west of the river in the borough of Dartford.
Split into simpler sentences: It is named after the valley of the Ebbsfleet River, which it straddles. The eastern part of the site is in the borough of Gravesham and the portion west of the river in the borough of Dartford.