Complex sentence: The first three of these are consistently among the highest-rated shows on British television, and all the serials are even reputedly popular amongst members of the country's Royal Family, including Elizabeth II herself.
Split into simpler sentences: The first three of these are consistently among the highest-rated shows on British television. Such is the magnitude of the popularity of the soap genre in the UK that all serials are reputedly enjoyed by members of the country's Royal Family, including Elizabeth II herself.