Simplify the following text for a Grade 10 native English-speaking person.
Original: The number of stripes also changed : originally , the flag was designed with seven horizontal stripes , and in 1845 it was officially changed to eight stripes ( and at one point , nine but was changed back to eight ) .
Simplified: The number of stripes also changed : originally , the flag was designed with seven horizontal stripes , and in 1845 it was officially changed to eight stripes .