Complex sentence: In the late 1980s and early 1990s, first Javelin Software then Lotus Improv and later Quantrix appeared and unlike models in a conventional spreadsheet, they utilized models built on objects called variables, not on data in cells of a report.
Split into simpler sentences: In the late 1980s and early 1990s, first Javelin Software and Lotus Improv appeared and later Quantrix. Unlike models in a conventional spreadsheet, they utilized models built on objects called variables, not on data in cells of a report.