Complex sentence: He made himself conspicuous by his support of Walpole on the question of the excise and, like Walpole, he served as a founding governor of the popular charity the Foundling Hospital when it opened its doors in 1739.
Split into simpler sentences: He made himself conspicuous by his support of Walpole on the question of the excise. With Walpole, he served as a founding governor of the popular charity the Foundling Hospital when it opened its doors in 1739.