Complex sentence: I have a proportion of technical knowledge which, like that of my colleagues, is not generally available but am happy to help clarify pages that are based on a'general understanding' of a given area, and what it relates to.
Split into simpler sentences: I have a technical knowledge which, like that of my colleagues, is not generally available. I am happy to help clarify pages that are based on a'general understanding' of a given area, and what it relates to.