Complex sentence: In the third chapel on the left "S.Sebastiano" (1614) by Giovanni De Vecchi, while the second chapel houses the tomb Giovanni Della Casa, author of "Il Galateo".
Split into simpler sentences: In the third chapel on the left "S.Sebastiano" (1614) by Giovanni De Vecchi. In second chapel is the tomb Giovanni Della Casa, author of "Il Galateo".