Complex sentence: Wexler considers it possible that the Slavicized descendants of the Khazars immigrated north and westward, causing some Eastern Slavic terms for Jewish holidays to becoming part of Western Slavic.
Split into simpler sentences: Wexler considers it possible that the Slavicized descendants of the Khazars immigrated north and westward. Causing some Eastern Slavic terms for Jewish holidays to becoming part of Western Slavic.