Complex sentence: During his first 17 years as a writer he used the name "Benigno Casaccia Bibolini", until he adopted the name of "Gabriel Casaccia", under which his best known works were produced.
Split into simpler sentences: During his first 17 years of literary production he wrote under both of his family names as "Benigno Casaccia Bibolini". Later on, he adopted the name of Gabriel Casaccia, under which name his best known works were produced.