Complex sentence: Jude Southerland Kessler is an author and John Lennon biographer in Shreveport, Louisiana, who is also recognized as an authority on The Beatles and specifically, the life of John Winston Lennon.
Split into simpler sentences: Jude Southerland Kessler is an author and John Lennon biographer living in Shreveport, Louisiana. She is also consulted as an authority on The Beatles and specifically, as an expert on the life of John Winston Lennon.