Complex sentence: Its fourth season premiere was viewed by nearly 12 million viewers in the United States, most of which were in rural markets; its rural audience share has ranked in the 30s, an extremely high number for any series, broadcast or cable.
Split into simpler sentences: Its fourth season premiere was viewed by nearly 12 million viewers in the United States, most of which were in rural markets. Its rural audience share has ranked in the 30s, an extremely high number for any series, broadcast or cable.