Complex sentence: She was noted for a spectacularly high double axel and fast spins, though she missed the 1979-1981 seasons completely due to severe juvenile arthritis, which prevented her even from walking for months in 1979.
Split into simpler sentences: She was noted for a spectacularly high double axel and fast spins. She missed the 1979--1981 seasons completely due to severe juvenile arthritis, which prevented her from even walking for months in 1979.