Complex sentence: He attempted to run in the French presidential elections in 1981, but ended up dropping out of the race because of political and media lobbying following polls that showed a significant part of the electorate might vote for him.
Split into simpler sentences: He attempted to run in the French presidential elections in 1981, but ended up dropping out of the race because of political? JJJJJJ and media lobbying following polls that showed a significant part of the electorate might vote for him.