Complex sentence: Although still afloat and repairable, it was decided that the ship be abandoned and then towed to the Mulberry harbour, where on July 20 she was scuttled to form part of the artificial breakwater near Courseulles.
Split into simpler sentences: Although still afloat and repairable, it was decided that the ship be abandoned. She was then towed to the Mulberry harbour, where on July 20 she was scuttled to form part of the artificial breakwater near Courseulles.