Complex sentence: Subjected to religious persecution and violent pogroms, many emigrated and between 1875 and 1914 around 150,000 arrived in the United Kingdom, mostly in England.
Split into simpler sentences: Subjected to religious persecution and violent pogroms, many emigrated to Western nations in the late 19th and early 20th centuries. Between 1875 and 1914 around 150,000 arrived in the United Kingdom, mostly in England.