Original sentence: For greater consistency betweem more modern computers, a format such as PDF may be preferred; but PDF's are not traditionally distributed as editable documents whereas RTF's are.Neverthess, the RTF format is consistent enough from computer to computer to be considered highly portable and moderately acceptable for cross-platform use
Edited sentence: For greater consistency between more modern computers, a format such as PDF may be preferred; but PDFs are not traditionally distributed as editable documents whereas RTFs are.Nevertheless, the RTF format is consistent enough from computer to computer to be considered highly portable and moderately acceptable for cross-platform use