Complex sentence: After a long period of crise, she came back to "dolce vita" in Venice: he had probably love affairs with count Collaltino di Collalto, whom she dedicated a great part of her 311 poems to.
Split into simpler sentences: After a long period of crisis, she came back to "la dolce vita" in Venice. It is believed that in this time, she was involved in a love affair with Count Collaltino di Collalto, whom she dedicated a great part of her 311 poems to.