Complex sentence: This three-levelled structure of covered loggias, decorated with marble statuary, reclining river gods in niches, and balustrading, is constructed around a central fountain: here in this cool environment, sheltered from the blazing sun, day-long picnics would be held.
Split into simpler sentences: This three-levelled structure of covered loggias, decorated with marble statuary, reclining river gods in niches, and balustrading, is constructed around a central fountain. Here in this cool environment, sheltered from the blazing sun, day-long picnics would be held.