Complex sentence: Above the ground floor there is a mezzanine floor with six small balconies having marble corbels and a wrought iron railing; on the first floor there are two balconies with stone galleries and corbels.
Split into simpler sentences: Above the ground floor is a mezzanine floor with six small balconies having marble corbels and a wrought iron railing. On the first floor there are two balconies with stone galleries and corbels.