Simplify the following text for a Grade 4 native English-speaking person.
Original: It includes the religious holidays of Palm Sunday , Maundy Thursday ( Holy Thursday ) and Good Friday , and lasts from Palm Sunday ( or in the Eastern , Lazarus Saturday ) until , but not including , Easter Sunday , as Easter Sunday is the first day of the new season of The Great Fifty Days .
Simplified: It begins with Palm Sunday and leads up to Easter Sunday .