Simplify the following text for a Grade 15 native English-speaking person.
Original: Described by art historian Robert Rosenblum as having `` almost a generic character , an impersonal textbook idea of a perfect Impressionist painting '' , his work strongly invokes atmosphere and his skies are always very impressive .
Simplified: Described by art historian Robert Rosenblum as having `` almost a generic character , an impersonal textbook idea of a perfect Impressionist painting '' , his work strongly creates atmosphere and his skies are always very impressive .