Complex sentence: Noel Thomas David Gallagher (born 29 May 1967) is an English musician, singer and songwriter, formerly the lead guitarist, occasional lead singer and principal songwriter of Oasis.
Split into simpler sentences: Noel Thomas David Gallagher (born 29 May 1967) is an English musician, singer and songwriter. He served as the lead guitarist, occasional lead singer and principal songwriter of Oasis.