Complex sentence: A 1790 U.S. Census entry in New York for "Mary" living near John Simmons may point to her role as a tavern servant, and she could have worked for the Washingtons at the first Presidential Mansion through Simmons'wife's family connection to Samuel Fraunces.
Split into simpler sentences: A 1790 U.S. Census entry in New York for "Mary" living near John Simmons may point to her role as a tavern servant. In this vein, Mary could have worked for the Washingtons at the first Presidential Mansion through Simmons'wife's family connection to Samuel Fraunces.