Complex sentence: Schuss was also the unofficial mascot of the 1968 Winter Olympics in Grenoble, France, featuring a stylized cartoon character wearing skis, since when, every Olympic Games has had a mascot (excluding the 1972 Winter Olympics in Sapporo, Japan).
Split into simpler sentences: Schuss was also the unofficial mascot of the 1968 Winter Olympics in Grenoble, France, featuring a stylized cartoon character wearing skis. Ever since then, every Olympic Games has had a mascot (excluding the 1972 Winter Olympics in Sapporo, Japan).