Complex sentence: Designed by Antonette Rosato and William Maxwell, the exhibit includes 5,280 propellers mounted on the wall, which represents the number of feet Denver (Mile-High City) is located above sea-level.
Split into simpler sentences: Designed by Antonette Rosato and William Maxwell, the exhibit includes 5,280 propellers mounted on the wall. The number of propellers represents the number of feet Denver (the mile-high city) is located above sea-level.