Complex sentence: Geosynchronous orbits move up and down relative to a point on the earth's surface, because while geostationary orbits have an inclination of 0 degrees relative to the equator, geosynchronous orbits have varying inclinations.
Split into simpler sentences: Geosynchronous orbits move up and down relative to a point on the earth's surface. This is because while geostationary orbits have an inclination of 0 degrees relative to the equator, geosynchronous orbits have varying inclinations.