Complex sentence: By today's standards it was not entirely politically correct, most of the characters being foreign stereotypes; however, it was immensely popular, both in the UK and elsewhere, and especially in the countries the actors portrayed.
Split into simpler sentences: By today's standards it was perhaps not entirely politically correct, most of the characters being foreign stereotypes. However, it was immensely popular, both in the UK and elsewhere, and especially in the countries the actors portrayed.