Complex sentence: At the "Daily Planet" in Metropolis, Lois Lane (Margot Kidder) suspects that Clark Kent is Superman, and tests Clark by jumping out of a window, but Clark uses his powers to save her while appearing to have done nothing.
Split into simpler sentences: At the "Daily Planet" in Metropolis, Lois Lane (Margot Kidder) suspects that Clark Kent is Superman. She tests Clark by jumping out of a window, but Clark uses his powers to save her while appearing to have done nothing.