Complex sentence: During this period, Bhima slew a Rakhsasa named Baka (Vaka), at Vetrakiya controlled the affairs of the Kichaka Kingdom and freed that kingdom from Baka's reign of terror.
Split into simpler sentences: During this period, Bhima slew a Rakhsasa named Baka (Vaka), at Vetrakiya. By slaying the Rakshasa, Bhima freed that kingdom from Baka's the reign of terror.