Complex sentence: In 1992, Microsoft decided to add grammar checking as a feature of Word and licensed CorrecText, a grammar checker from Houghton Mifflin that had not yet been marketed as a standalone product.
Split into simpler sentences: In 1992, Microsoft decided to add grammar checking as a feature of Word. Microsoft licensed CorrecText, a grammar checker from Houghton Mifflin that had not yet been marketed as a standalone product.