Complex sentence: Fiesta has been a tradition in the Alamo City since April 1891, when local women decorated their carriages with live flowers, met in front of the Alamo and threw the blossoms at one another--the first Battle of Flowers.
Split into simpler sentences: Fiesta has been a tradition in the Alamo City since April 1891. That's when local women decorated their carriages with live flowers, met in front of the Alamo and threw the blossoms at one another--the first Battle of Flowers.