Complex sentence: In recent decades, waxless skis have been a force in the recreational ski market, having accounted for 75 percent of cross country sales in the United States in 1985, despite their typically poor performance compared with well-waxed skis.
Split into simpler sentences: In recent decades, waxless skis have become popular in the recreational ski market. Waxless skis accounted for 75 percent of cross country sales in the United States in 1985, despite their typically poor performance compared with well-waxed skis.