Original sentence: New antisemitism is a controversial concept of a new 21st-century form of antisemitism said to be emanating simultaneously from the left, the right, and fundamentalist Islam, and tending to manifest itself as opposition to Zionism and the State of Israel.The concept, however, is disputed by various academics
Edited sentence: New antisemitism is the concept that a new form of antisemitism is on the rise in the 21st century, emanating simultaneously from the left, the right, and fundamentalist Islam, and tending to manifest itself as opposition to Zionism and the State of Israel