Complex sentence: The Labia's wealth and power lasted until the fall of the Serene Republic in 1797 during the 19th century the Palazzo fell into decay, this also coincided with a period where Tiepolo's work was unpopular and unappreciated.
Split into simpler sentences: The Labia's wealth and power lasted until the fall of the Serene Republic in 1797. During the 19th century the Palazzo fell into decay, this also coincided with a period where Tiepolo's work was unpopular and unappreciated.