Complex sentence: In 62 he was promoted to the prefecture of the praetorian guard as the commander of the praetorian boduguard, he persecuted Faenius Rufus and Nymphidius Sabinus and killed off many of Neros enemies within Rome to become one of Neros most trusted and closest advisors.
Split into simpler sentences: In 62 he was promoted to the prefecture of the praetorian guard as the commander of the praetorian boduguard. Tigellinus persecuted Faenius Rufus and Nymphidius Sabinus and killed off many of Neros enemies within Rome to become one of Neros most trusted and closest advisors.