Complex sentence: Trump also has been involved in politics, especially since his father's presidential campaign, including facing criticism following the 2017 revelation of a meeting with a Russian lawyer, with the promise of receiving damaging information about Hillary Clinton's campaign in the 2016 presidential election.
Split into simpler sentences: Trump also has been involved in politics, especially during his father's presidential campaign. Trump Jr has faces criticism following the 2017 revelation of a meeting with a Russian lawyer, with the promise of receiving damaging information about Hillary Clinton's campaign in the 2016 presidential election.