Complex sentence: In particular, Greenspan vigorously rebuked Black's repeating the allegation of "extortion" described in an article written by Mark Steyn in Maclean's even Black himself told Greenspan in an e-mail that this allegation was unfounded and "I will support your version of this".
Split into simpler sentences: In particular, Greenspan vigorously rebuked Black's repeating the allegation of "extortion" described in an article written by Mark Steyn in "Maclean's". Even Black himself told Greenspan in an e-mail that this allegation was unfounded and "I will support your version of this".