Complex sentence: For example, a pulley made of unobtainium might be massless and frictionless; however, if used in a nuclear rocket unobtainium would be light, strong at high temperatures, and resistant to radiation damage.
Split into simpler sentences: For example, a pulley made of unobtainium might be massless and frictionless. However, if used in a nuclear rocket, unobtainium would be light, strong at high temperatures, and resistant to radiation damage.