Complex sentence: The Cogar 4 became the Singer 1500 after Singer Business Machines acquired Cogar Corporation and then in 1976 ICL acquired Singer Business Machines then changing the name of the computer to the ICL 1500.
Split into simpler sentences: The Cogar 4 became the Singer 1500 after Singer Business Machines acquired Cogar Corporation. In 1976 International Computers Limited (ICL) acquired Singer Business Machines, changing the name of the computer to the ICL 1500.