Complex sentence: Oakeshott's support for Labor didn't play well with his constituents; despite his large personal majority, both his federal and state electorates were still comfortably safe National seats in "traditional" two-party matchups.
Split into simpler sentences: Oakeshott's support for Labor didn't play well with his constituents. Despite his large personal majority, both his federal and state electorates were still comfortably safe National seats in "traditional" two-party matchups.