Complex sentence: In 1682, he became a companion to the statesmen Fyodor Shaklovity and Ivan Miloslavsky, and a campaigner for Sophia of Russia, who trusted him as her most faithful follower.
Split into simpler sentences: In 1682, he became a companion to the statesmen Fyodor Shaklovity and Ivan Miloslavsky. He was a campaigner for Sophia of Russia, who trusted him as her most faithful follower.