Complex sentence: In the course of their 3 1/2 year collaboration they toured throughout the U.S., Europe, Brazil, and South Africa and were featured on the NBC Tonight Show, Merv Griffin, and their own PBS special from New York's Cafe Carlyle.
Split into simpler sentences: In the course of their three and a half year collaboration, they toured throughout the US, Europe, Brazil, and South Africa. They appeared on the NBC Tonight Show, the "Merv Griffin" show, and broadcast a PBS show from New York's Cafe Carlyle.