Complex sentence: The top has a central lunette depicting blessing Saint Ambrose surrounded by a round arch and next to it there are two arched windows; the whole is surmounted by a pediment and above it there is a small tower.
Split into simpler sentences: The top has a central lunette depicting the blessing of Saint Ambrose, surrounded by a round arch, and next to it there are two arched windows. This section is surmounted by a pediment, and above it there is a small tower.