Complex sentence: Patricia "Patti" Starr (born 1943) was the chair of Ontario Place from 1986 to 1989, achieveing a substntial drop in the operating deficit and rejuvenating the fledgling park.
Split into simpler sentences: Patricia "Patti" Starr (born 1943) was the chair of Ontario Place from 1986 to 1989. During her tenure she achieved a substantial drop in the operating deficit, rejuvenating the fledgling park.