Complex sentence: Like her son, she was proficient at the practical things such as martial arts and firearms; she is shown to have been a merciless killer and at some point wore an eye patch for as-yet-unexplained reasons.
Split into simpler sentences: Like her son, she was proficient at the practical things such as martial arts and firearms. She is shown to have been a merciless killer and at some point wore an eye patch for as-yet-unexplained reasons.