Complex sentence: The Valorians were a superhuman race, while the Rulons were a mixture of humanoid creatures--both of which came from the future, however ended up transported back in time to the age of Dinosaurs.
Split into simpler sentences: The Valorians were a superhuman race, while the Rulons were a mixture of humanoid creature. Both of came from the future but ended up transported back in time to the age of Dinosaurs.