Complex sentence: In 1586, Kelley and Dee found the patronage of the wealthy Bohemian count Lord William of Rosenberg, a senior official from a powerful family who also shared Kelley and Dee's alchemical interests and is known to have participated in spiritual sessions with the two men.
Split into simpler sentences: In 1586, Kelley and Dee found the patronage of the wealthy Bohemian count Lord William of Rosenberg. Rožmberk was a senior official from a powerful family who also shared Kelley and Dee's alchemical interests, and is known to have participated in spiritual sessions with the two men.