Complex sentence: As CINCNAVHOME he is responsible for naval training and reserve establishments in the United Kingdom, and his flagship is HMS "Victory", the world's oldest commissioned warship, which is preserved in dry dock in Portsmouth.
Split into simpler sentences: As CINCNAVHOME he is responsible for naval training and reserve establishments in the United Kingdom. This latter role gives him a flagship, HMS "Victory", the world's oldest commissioned warship, which is preserved in dry dock in Portsmouth.