Complex sentence: An internal force of soldiers with a policing role, named the "regulators," was eventually formed to counter the theft and violence of the Andersonville Raiders, and it was in the early years of the 1860s that leading members were finally brought to trial.
Split into simpler sentences: An internal force of soldiers with a policing role, called the "regulators," was eventually formed to counter the theft and violence of the Andersonville Raiders. In the early years of the 1860s, leading members were finally brought to trial.