Complex sentence: Shortly before completing the work in 1989, he decided to sell the vessel to Bristol City Museum and Art Gallery, based at Bristol Industrial Museum where restoration and preservation was completed in 1995.
Split into simpler sentences: Shortly before completing the work in 1989, he decided to sell the vessel to Bristol City Museum and Art Gallery. She was sold, and underwent various modifications before being sold in 1989 to Bristol City Museum and Art Gallery, where restoration and preservation was completed in 1995.