Complex sentence: A boathouse was purchased in 1963 and remodeled into a clubhouse, which was moored at Red's Moorage near the Sauvie Island bridge, which later became Larson's moorage.
Split into simpler sentences: A boathouse was purchased in 1963 and remodeled into a clubhouse. That clubhouse was moored at Red's Moorage near the Sauvie Island bridge, which later became Larson's moorage.