Complex sentence: He was a writer for "The Tonight Show with Conan O'Brien" until January 22,2010 and has stayed on Conan O'Brien's writing staff for the TBS television program, "Conan".
Split into simpler sentences: He was a writer for "The Tonight Show with Conan O'Brien" until January 22,2010. He has stayed on Conan O'Brien's writing staff for his new show on TBS, "Conan".