Complex sentence: Flellis explains that his friend and mentor Dr Francis B. Gröss died while Flellis himself was performing a routine operation on him, although it remains unclear why, in reality, actor Michael Carr did not return to portray Gröss again.
Split into simpler sentences: Flellis explains that his friend and mentor Dr Francis B. Gröss died while Flellis himself was performing a routine operation on him, although it remains unclear why. In reality, actor Michael Carr did not return to portray Gröss again.