Who Trained Yamato?

Kakashi recruited Yamato to help with Naruto's training in creating a new technique. In addition to being able to create training devices for Naruto with his Wood Release abilities, Yamato was also able to subdue Naruto if he lost control of the Nine-Tails' chakra.

How did Yamato get controlled?

From the final episode of the Naruto canon storyline, 479, we see that Yamato was released from the Infinite Tsukuyomi by Naruto and Sasuke. Afterwards, the God Tree was cut down, so the spiral zetsu that was controlling Yamato decomposed.

Is Yamato a Senju?

Yamato Senju (千手裕一, Senju Yamato) is the current Head of the Senju Clan and one of Konohagakure 's most powerful shinobis.