Complex sentence: Nicknamed the "Nordic Nightmare", Helenius is one of the heavyweight division's top prospects, he is known for his punching power and durability, and throughout his career has defeated three former world heavyweight champions.
Split into simpler sentences: Nicknamed the "Nordic Nightmare", Helenius is one of the heavyweight division's top prospects. He is known for his punching power and durability, and throughout his career has defeated three former world heavyweight champions.