Complex sentence: In 1980, Ross-Loos Medical Group was purchased by the Insurance Company of North America (INA) and merged into it's operations, It's new name was "INA and Ross-loos Healthpans".
Split into simpler sentences: In 1980, Ross-Loos Medical Group was purchased by the Insurance Company of North America (INA) and merged into its operations. Its new name was "INA and Ross-loos Healthpans".