Complex sentence: UCLA professor, Dr. Davis McClaren (Bruce Greenwood), arrives at the base and along with Shepard's boss, Dr. Andy Harrison (Gerard Plunkett), presses Shepard to take McClaren to Mount Melbourne to attempt to find a rare meteorite from the planet Mercury.
Split into simpler sentences: UCLA professor, Dr. Davis McClaren (Bruce Greenwood), arrives at the base. He presses Shepard to take him to Mount Melbourne to attempt to find a rare meteorite from the planet Mercury.