Complex sentence: From October 1971 to April 1973, Weatherill was Vice-Chamberlain of Her Majesty's Household, an office usually held by a Government whip, as Weatherill then was.
Split into simpler sentences: From October 1971 to April 1973, Weatherill was Vice-Chamberlain of Her Majesty's Household. This office is usually held by a Government whip, as Weatherill then was.