Simplify the following text for a Grade 6 native English-speaking person.
Original: By the middle of 1903 there was a fifth edition sporting colored endpapers ... a sixth printing was produced within the month '' ; and a year after the first commercial publication there were 56,470 copies in print .
Simplified: By the middle of 1903 there was a fifth printing , and in the same month , there was a sixth printing . A year after the first commercial publication there were 56,470 copies printed .