Simplify the following text for a Grade 10 native English-speaking person.
Original: The pre-Roman Britons used mostly unpaved trackways for their communications , including very ancient ones running along elevated ridges of hills , such as the South Downs Way , now a public long-distance footpath .
Simplified: The pre-Roman Britons used unpaved trackways , including very ancient ones running along the ridges of hills , such as the South Downs Way , now a public long-distance footpath .