Complex sentence: Ayer became Vice President of HartRe in 1983, President of Hartford Specialty Company in 1986, Senior Vice President of The Hartford in 1989, Executive Vice President of The Hartford in 1990, and President and COO of the company's property-casualty operations in 1991.
Split into simpler sentences: Ayer became Vice President of HartRe in 1983, President of Hartford Specialty Company in 1986, and Senior Vice President of The Hartford in 1989. Ayer then became Executive Vice President of The Hartford in 1990, and President and COO of the company's property-casualty operations in 1991.