Complex sentence: Upon returning to London, Bond is indefinitely suspended from field duty by the, who is in the midst of a power struggle with C, the head of the privately-backed Joint Intelligence Service, consisting of the recently merged MI5 and MI6.
Split into simpler sentences: Upon returning to London, Bond is indefinitely suspended from field duty by the. M is in the midst of a power struggle with C, the head of the privately-backed Joint Intelligence Service, consisting of the recently merged MI5 and MI6.