Simplify the following text for a Grade 11 native English-speaking person.
Original: Lyell 's books had widepread influence , not least on the up and coming young geologist Charles Darwin who read them with enthusiasm during his voyage on the Beagle , and has been described as Lyell 's first disciple .
Simplified: Lyell 's books had widepread influence , not least on the up and coming young geologist Charles Darwin who read them with enthusiasm during his voyage on the Beagle .