Do the following sentences sound awkward/ stilted? how are they in terms of grammar?

"The study of history heavily relies on textual records, which are, to some extent, value-laden or subjective. Worse still, since peer-review was not a strict practice in the past, it is likely that some historical claims, however convincing, might have been deliberately fabricated or distorted. This is possible in cases where there were very few people who witnessed a certain event, making it easy for them to exaggerate or deny what they saw."