Complex sentence: Meanwhile, Palpatine travels to Mustafar and finds Vader barely alive and brings him back to Coruscant, where his burned body is repaired with cybernetic limbs and a respiratory suit.
Split into simpler sentences: Meanwhile, Palpatine travels to Mustafar and finds Vader badly burnt, but still alive. Palpatine brings him back to Coruscant, where his burned body is repaired with cybernetic limbs and a respiratory suit.