Complex sentence: The final room on the upper floor open to the public is the General's Room, dedicated to the memory of Sir George Higginson, the great-grandfather of the present Viscount Ashbrook, and contains memorabilia relating to him.
Split into simpler sentences: The final room on the upper floor open to the public is the General's Room. This is dedicated to the memory of Sir George Higginson, the great grandfather of the present Viscount Ashbrook, and contains memorabilia relating to him.