Complex sentence: At this early stage, the locals were still weary of the partisans and concerned for their lives and property and on February 4th petitioned Mosby to cease his operations, to which Mosby quickly refused.
Split into simpler sentences: At this early stage, the locals were still wary of the partisans and concerned for their lives and property. On February 4, they petitioned Mosby to cease his operations, to which Mosby quickly refused.