Complex sentence: Nogai Khan led an invasion of Hungary, with Talabuga, and his army ravaged Transylvania; cities such as Reghin, Brașov and Bistrița were plundered.
Split into simpler sentences: Nogai Khan led an invasion of Hungary with Talabuga. He led an army which ravaged Transylvania; cities such as Reghin, Brașov and Bistrița were plundered.