Complex sentence: Patterson joined the band in 2005 to replace original guitarist Brian Welch in concerts, after performing with the band unplugged concert Patterson was fired after a personal fallout with James "Munky" Shaffer.
Split into simpler sentences: Patterson joined the band in 2005 to replace original guitarist Brian Welch in concerts. After performing with the band unplugged concert, he was fired after a personal fallout with James "Munky" Shaffer.