Complex sentence: Iapetus is best known for its dramatic'two-tone' coloration, but discoveries by the "Cassini" mission in 2007 revealed several other unusual features, such as a massive equatorial ridge running three-quarters of the way around the moon.
Split into simpler sentences: Iapetus is best known for its dramatic'two-tone' coloration. Discoveries by the "Cassini" mission in 2007 revealed several other unusual features, such as a massive equatorial ridge running three-quarters of the way around the moon.