Complex sentence: Mitsuhide was thought to be killed in "Sengoku Basara 3", however, by that time, a masked monk named Tenkai who looks eerily similar to Mitsuhide appeared, manipulating Kobayakawa Hideaki.
Split into simpler sentences: Mitsuhide was thought to be killed in "Sengoku Basara 3". However, by that time, a masked monk named Tenkai appeared, looking eerily similar like Mitsuhide, now manipulating Kobayakawa Hideaki.