Complex sentence: When sources of equal quality are available the ease of access may be preferred, but if sources of higher quality are difficult to verify, that difficulty alone is not a reason to disregard such sources or replace them with lower-quality ones.
Split into simpler sentences: When sources of equal quality are available, the ease of access may be preferred. But if sources of higher quality are difficult to verify, that difficulty alone is not a reason to disregard such sources or replace them with lower-quality ones.