Complex sentence: The transport in São Paulo is commonly called chaotic (title criticized by experts because of the superficiality with which the issue is dealt), one of the main items of political campaign of several major city in times of political elections.
Split into simpler sentences: The transport in São Paulo is commonly referred to as chaotic, although that title is criticized by experts because of the superficiality with which the issue is dealt. Improvement for this situation is one of the main items of political campaign of several major cities in times of political elections.