Complex sentence: Founded in 1919 as "Lake Union Dry Dock And Machine Works", Lake Union Dry Dock is amongst the oldest businesses still currently operating in Seattle; they retain the distinction of being the last remaining "all-wooden" dock in that City.
Split into simpler sentences: Founded in 1919 as "Lake Union Dry Dock And Machine Works", Lake Union Dry Dock is amongst the oldest businesses still currently operating in Seattle. It retais the distinction of being the last remaining all-wooden dock in that City.