Complex sentence: Nancy Silverton is an American chef and baker who is the author of several cookbooks and has been at the forefront of efforts to revitalize sourdough and artisan breads in the United States.
Split into simpler sentences: Nancy Silverton is an American chef and baker. She is the author of several cookbooks and has been at the forefront of efforts to revitalize sourdough and artisan breads in the United States.