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I'm trying to decide which sentence is best to use. First, can you please check the grammar, punctuation, etc.? Second, can you please tell me which sentence is best?

NBC had 30 million people watch the Cowboys vs. Redskins; however, they refuse to promote their fledgling cable sports channel, NBC Sports Network, with extended post game show on there.

NBC had 30 million people watch the Cowboys vs. Redskins; however, they refuse to promote their fledgling cable sports channel, NBC Sports Network, with an extended post game show.

NBC had 30 million people watch the Cowboys vs. Redskins; however, they refuse to promote their fledgling cable sports channel, NBC Sports Network, by not putting an extended post game show on there.

NBC's Sunday Night Football telecast had 30 million viewers watch the Cowboys vs. Redskins; however, they refuse to promote their fledgling cable sports channel, NBC Sports Network, with an extended post game show on there.
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NBC had 30 million people watching the Cowboys vs. Redskins, but they refused to promote their fledgling cable sports channel, NBC Sports Network, with an extended post-game show.
Comments  
Students: Are you brave enough to let our tutors analyse your pronunciation?
Thanks, what's wrong with putting a semicolon after Redskins and using however instead of but?
mikebwhat's wrong with putting a semicolon after Redskins and using however instead of but?
It's rather stilted: overly formal for a sports report and it slows the flow.