Original sentence: Working closely with Thomas Jefferson, he created  a republican party, in opposition to the Federalist or, as the republicans called it, "aristocratic", party.they built a movement of congressional and grass roots political activism that was victorious in the "Revolution of 1800
Edited sentence: Working closely with Thomas Jefferson, they created the Republican Party, in opposition to the Federalist party, building a movement of congressional and grass roots political activism that was victorious in the "Revolution of 1800