Simplify the following text for a Grade 7 native English-speaking person.
Original: Kricogonia lyside , commonly known as the Lyside Sulphur or Guayacan Sulphur , is a North and South American butterfly in the family Pieridae .
Simplified: The Lyside Sulphur or Guayacan Sulphur ( Kricogonia lyside ) is a North American and South American butterfly . It is in the family Pieridae .