Complex sentence: In his old age, Silvermane attempted to prolong his life by transforming himseld into a cyborg; he has occasionally attempted to boost the power of his remaining organic parts by harvesting parts from the superhuman body of his nemesis, Spider-Man.
Split into simpler sentences: In his old age, Silvermane attempted to prolong his life by transforming himself into a cyborg. He has occasionally attempted to boost the power of his remaining organic parts by harvesting parts from the superhuman body of his nemesis, Spider-Man.