Complex sentence: He wrote the introductions to the program guides for Phish's 2009 Halloween performance of "Exile on Main Street" and 2010 Halloween performance of "Waiting for Columbus".
Split into simpler sentences: He wrote the introduction to the program guide for Phish's 2009 Halloween performance of "Exile on Main Street". He also wrote the introduction to the program guide for Phish's 2010 Halloween performance of "Waiting for Columbus".