Complex sentence: He remained at Cambridge temporarily as a coach, before being called to the bar in 1837, and becoming private secretary to Henry Labouchere, later 1st Baron Taunton, who was then the President of the Board of Trade.
Split into simpler sentences: He remained at Cambridge temporarily as a coach, before being called to the bar in 1837. He became private secretary to Henry Labouchere, later 1st Baron Taunton, who was then the President of the Board of Trade.