Complex sentence: The Celtic Riddle is the fourth of the four TV movies inspired by the classic, long-running mystery series Murder, She Wrote is also the first based on a novel, namely Lyn Hamilton's The Celtic Riddle.
Split into simpler sentences: The Celtic Riddle is the fourth of the four TV movies inspired by the classic, long-running mystery series Murder, She Wrote. It is also the first based on a novel, Lyn Hamilton's The Celtic Riddle.