Complex sentence: Upon adulthood, Oxana has been taught to subdue her dog-like behavior, she learned to speak fluently and intelligently, she works at the farm milking cows, but remains somewhat intellectually impaired.
Split into simpler sentences: Upon adulthood, Oxana has been taught to subdue her dog-like behavior. She learned to speak fluently and intelligently and works at the farm milking cows, but remains somewhat intellectually impaired.