Complex sentence: Even Garmadon himself admits that he still has feelings for Misako, as he knows that things didn't work out for them when his evil grew; he even admits that he would allow her to rule with him by his side.
Split into simpler sentences: Even Garmadon himself admits that he still has feelings for Misako, as he knows that things didn't work out for them when his evil grew. He also admits that he would allow her to rule with him by his side.