Complex sentence: Fruit blossoms and leaves were woven into garlands to decorate walls and vaulted ceilings, and petals were piled into baskets or strewn on the floors, streets, or allowed to float down from balconies.
Split into simpler sentences: Fruit blossoms and leaves were woven into garlands to decorate walls and vaulted ceilings. Petals were piled into baskets or strewn on the floors, streets or to float down from balconies.