Complex sentence: Doris Shadbolt' (OC) (1918-2003) was a Canadian art interpreter and art activist who made a significant contributions to the art community on regional, national, and international levels.
Split into simpler sentences: Doris Shadbolt' (OC) (1918-2003) was a Canadian art interpreter and art activist. Individually, they have made significant contributions to the art community on regional, national, and international levels.