Complex sentence: These experiments are expected to help clarify the origin of Earth's moon whereas two of the penetrators are planned to land near the Apollo 11 and Apollo 12 landing sites, taking advantage of seismic data gathered there from 1969 to 1974.
Split into simpler sentences: These experiments are expected to help clarify the origin of the Moon. Two of the penetrators are planned to land near the Apollo 11 and Apollo 12 landing sites, taking advantage of seismic data gathered there from 1969 to 1974.