Simplify the following text for a Grade 7 native English-speaking person.
Original: It was revised and privately printed by Potter in 1901 after several publishers ' rejections but was printed in a trade edition by Frederick Warne & Co. in 1902 .
Simplified: It was corrected and privately printed by Potter in 1901 after several publishers refused to print the book . It was printed by Frederick Warne & Co. in 1902 .