Complex sentence: It was formerly known as DMG, Inc. and changed its name to Diversified Mortgage Investors, Inc. in 1978, then to Danaher Corporation in 1984.
Split into simpler sentences: It was formerly known as DMG, Inc. and changed its name to Diversified Mortgage Investors, Inc. in 1978. Further, the company changed its name to Danaher Corporation in 1984.