Complex sentence: Once ensconced back in Sydney, he proved to be a diligent and capable Principal Surgeon, although his work was hampered by a perpetual paucity of supplies and assistants, about which he frequently complained to the authorities.
Split into simpler sentences: Once ensconced back in Sydney, Jamison proved to be a diligent and capable medical practitioner. His work was hampered, however, by a perpetual paucity of supplies and assistants, about which he frequently complained to the authorities.