Complex sentence: Plath is credited with advancing the genre of confessional poetry and is best known for two of her published collections, "The Colossus and Other Poems" and "Ariel", and "The Bell Jar", a semi-autobiographical novel published shortly before her death.
Split into simpler sentences: Plath is credited with advancing the genre of confessional poetry and is best known for her two published collections, "The Colossus and Other Poems" and "Ariel". She also wrote "The Bell Jar", a semi-autobiographical novel published shortly before her death.