Complex sentence: He has exhibited at the Newport, Rhode Island, and Providence, Rhode Island, flowershows, and continues to lecture widely on horticulture, the history of garden and landscape design and their intersection with popular culture, and his own projects and personal gardens.
Split into simpler sentences: He has exhibited at the Newport, Rhode Island, and Providence, Rhode Island, flowershows. He continues to lecture widely on horticulture, the history of garden and landscape design and their intersection with popular culture, and his own projects and personal gardens.