Complex sentence: After Orman gained a substantial early lead in the polls, the Roberts team launched a very effective persuasion and GOTV effort that saw numerous national republican leaders coming to Kansas and ended with him winning 53% of the vote to Orman's 43%.
Split into simpler sentences: After Orman gained a substantial early lead in the polls, the Roberts team launched an effective persuasion and voter turnout effort that saw numerous national republican leaders coming to Kansas. Roberts won the election with 53% of the vote to Orman's 43%.