Complex sentence: In 1990, the shareholders were approached by a representative of Mike Harper, who ultimately negotiated the purchase of the bank for Ameriwest, a holding company is currently owned by Chris and Betsy Murphy.
Split into simpler sentences: In 1990, the shareholders were approached by a representative of Mike Harper, who ultimately negotiated the purchase of the bank for Ameriwest. That a holding company is currently owned by Chris and Betsy Murphy.