Complex sentence: On the west side, the building has a public hill climb on two flights of outdoor escalators that were encased in clear tubes until 2006 when they were updated with a simpler, yet more modern glass roof.
Split into simpler sentences: On the Western side, the building has a public hill climb consisting on 2'flights' of outdoor escalators. These escalators of the building were encased in clear tubes until 2006 when they were updated with a simpler, yet more modern glass roof.