Original sentence: A GUI uses windows, icons, and  menus to carry out commands such as opening files, deleting files, moving files, etc.In 1973 Xerox PARC developed the Xerox Alto personal computer.In 1974, work began on Gypsy, the first bitmap What-You-See-Is-What-You-Get (WYSIWYG) cut & paste editor.It was the first computer to use the desktop metaphor and graphical user interface (GUI).Short for Graphical User Interface, the GUI was first developed at Xerox PARC by Alan Kay, Douglas Engelbart, and a group of other researchers.The Alto greatly influenced the design of personal computers in the following decades, notably the Macintosh and the first Sun workstations.and although many GUI Operating Systems are operated by using a mouse, the keyboard can also be used by using keyboard shortcuts or arrow keys
Edited sentence: Although many GUI Operating Systems are operated by using a mouse, the keyboard can also be used by using keyboard shortcuts or arrow keys.Although not commercially successful, Star greatly influenced future developments, for example at Apple, Microsoft and Sun Microsystems.In 1973 Xerox PARC developed the Alto personal computer.In 1974, work began at PARC on Gypsy, the first bitmap What-You-See-Is-What-You-Get (WYSIWYG) cut & paste editor.In 1981 Xerox introduced a pioneering product, Star, incorporating many of PARC's innovations.It had a bitmapped screen, and was the first computer to demonstrate the desktop metaphor and graphical user interface (GUI).It used windows, icons and menus to support commands such as opening files, deleting files, moving files, etc.The Alto greatly influenced the design of personal computers during the late 1970s and early 1980s, notably the Three Rivers PERQ, the Apple Lisa and Macintosh, and the first Sun workstations.The GUI was first developed at Xerox PARC by Alan Kay, Larry Tesler, Dan Ingalls and a number of other researchers