Complex sentence: However, Loret was considered only an average individual and not overly diligent, an it would have been unusual for him to have gained such a a high post on own merit when still in his early twenties.
Split into simpler sentences: However, Loret was considered only an average individual and not overly diligent. It would have been unusual for him to have gained such a a high post on own merit when still in his early twenties.