Complex sentence: Moreover, many Windows software programs have been written since the 1980s to assume that the screen provides 96 PPI, and accordingly, these programs do not display properly at common alternative resolutions such as 72 PPI or 120 PPI.
Split into simpler sentences: Moreover, many Windows software programs have been written since the 1980s which assume that the screen provides 96 PPI. Accordingly, these programs do not display properly at common alternative resolutions such as 72 PPI or 120 PPI.