Complex sentence: Smith has appeared many times on both "The Tonight Show" with Jay Leno as well as "the Late Show with David Letterman" and has toured the comedy circuit doing live performances throughout the United States and beyond including Britain, Ireland and Australia.
Split into simpler sentences: Smith has appeared many times on both "The Tonight Show" with Leno, as well as "the Late Show with David Letterman". She has toured the comedy circuit doing live performances throughout the United States and beyond including Britain, Ireland and Australia.