Complex sentence: In 1588, the Szekler Sabbatarians of Transylvania, united under the unitarian nobleman András Eőssi, and observed Christian versions of all of the biblical Jewish Holy Days, and also rejected observance of Christmas, Easter, and New Year's Day.
Split into simpler sentences: In 1588, the Szekler Sabbatarians of Transylvania united under the unitarian nobleman András Eőssi, and observed Christian versions of all of the biblical Jewish Holy Days. They also rejected the observance of Christmas, Easter, and New Year's Day.