Complex sentence: Booker Kudo, or Yuusaku Kudo, is a fictional character from Case Closed is a famous mystery novelist married to Vivian Kudo (Yukiko) with whom he had Jimmy (Shin'ichi).
Split into simpler sentences: Booker Kudo, or Yuusaku Kudo, is a fictional character from Case Closed. He is a famous mystery novelist married to Vivian Kudo (Yukiko) with whom he had Jimmy (Shin'ichi).