Complex sentence: While Members of either body may insert material into the Extensions of Remarks portion of the Record, Senators rarely do so, and the overwhelming majority of what is found there is entered at the request of Members of the House of Representatives.
Split into simpler sentences: While Members of either body may insert material into the Extensions of Remarks portion of the Record, Senators rarely do so. The overwhelming majority of what is found there is entered at the request of Members of the House of Representatives.