Complex sentence: One common feature of skyscrapers is having a steel framework from which curtain walls are bearing on the framework below or possibly suspended from the framework above, rather than load-bearing walls of conventional construction.
Split into simpler sentences: One common feature of skyscrapers is having a steel framework that supports curtain walls. These curtain walls either bear on the framework below or are possibly suspended from the framework above, rather than load-bearing walls of conventional construction.