Complex sentence: In the 19th century many Jewish Germans converted to Christianity, most of them becoming Protestants rather than Roman Catholics, a lot of Germans went in the 19th century to the Netherlands, those have got the religion Niedergerman Protestant Dutch and became from German quickly Dutch citizens.
Split into simpler sentences: In the 19th century many Jewish Germans converted to Christianity, most of them becoming Protestants rather than Roman Catholics. A lot of Germans went in the 19th century to the Netherlands, those have got the religion Niedergerman Protestant Dutch and became from German quickly Dutch citizens.