Complex sentence: Pascua Florida Day is usually celebrated on April 2 (the day on which Ponce de León first spotted Florida) unless it falls on a weekend, in which case the governor may declare either the preceding Friday or the following Monday as the state day.
Split into simpler sentences: Pascua Florida Day is usually celebrated on April 2, unless the 2nd falls on a weekend. When it falls on a Saturday or Sunday, the governor may declare either the preceding Friday or following Monday as the state day.