Complex sentence: She met Lacey Baker, an American playwright who wrote "In the Light" and an actress with the Provincetown Players, in 1919, when Phillips attended a pageant where Lacey-Baker was performing.
Split into simpler sentences: She met Lacey Baker, an American playwright who wrote "In the Light" and an actress with the Provincetown Players, in 1919. At that time, Phillips attended a pageant where Lacey-Baker was performing.