Simplify the following text for a Grade 10 native English-speaking person.
Original: Initially influenced by Toulouse Lautrec , Gauguin and other late 19th century innovators Pablo Picasso made his first cubist paintings based on CÃ zanne 's idea that all depiction of nature can be reduced to three solids : cube , sphere and cone .
Simplified: Pablo Picasso made his first cubist paintings based on CÃ zanne 's idea that all depiction of nature can be reduced to three solids : cube , sphere and cone .