Complex sentence: Jacoby has spoken about the important role secularism played in the development of political and social events in the history of the United States, and she argues this is often written out of American history by the religious right.
Split into simpler sentences: Jacoby has spoken about the important role secularism played in the development of political and social events in the history of the United States. She argues that this is often written out of American history by the religious right.