Complex sentence: Known by his professional reputation, Michael is regarded with fear by people associated with the intelligence community and once remarked by a Spetsnaz wet work operative that everyone in Russian Special Forces has heard of the name Michael Westen.
Split into simpler sentences: Known by his professional reputation, Michael is regarded with fear by people associated with the intelligence community. A Spetsnaz wet work operative remarked that everyone in Russian Special Forces has heard of the name Michael Westen.