Complex sentence: Wadlow became a celebrity after his 1936 U.S. tour with the Ringling Brothers Circus and his 1938 promotional tour with the International Shoe Company (since 1966 called INTERCO).
Split into simpler sentences: Wadlow became a celebrity after his 1936 U.S. tour with the Ringling Brothers Circus. In 1938 he did a promotional tour with the International Shoe Company (since 1966 called INTERCO).