Complex sentence: Werner Günthör (born June 1,1961 in Uttwil) is a former Swiss track and field athlete, who was the best shot putter in the history of Swiss track and field.
Split into simpler sentences: Werner Günthör (born June 1,1961, in Uttwil) is a former Swiss track and field athlete. Günthör was the best shot putter in the history of Swiss track and field.