Complex sentence: WIMP-style user interfaces place visually impaired users at a disadvantage, especially when alternative text-based interfaces are not made available, and researchers are exploring other alternatives that make modern computer systems more accessible.
Split into simpler sentences: WIMP-style user interfaces place visually impaired users at a disadvantage, especially when alternative text-based interfaces are not made available. Researchers have been exploring other alternatives that make modern computer systems more accessible.