Simplify the following text for a Grade 5 native English-speaking person.
Original: In Britain , it has two flight periods , Aprilâ `` May and Julyâ `` August , but is continuously-brooded in North America , being one of the first butterflies to emerge from the chrysalis in spring , flying until hard freeze in the fall .
Simplified: It has two flight periods , Aprilâ `` May and Julyâ `` August .