Complex sentence: In 1999 Mews published "The Lost Love Letters of Heloise and Abelard" (1999) about 113 medieval love letters, edited in 1974 by the German scholar Ewald Koensgen.
Split into simpler sentences: In 1999 Mews published "The Lost Love Letters of Heloise and Abelard" (1999). This contains about 113 medieval love letters, edited in 1974 by the German scholar Ewald Koensgen.