Complex sentence: On 7 March 2013 while filming an episode of "Fashion Police" with guest Melissa Rivers, Osbourne collapsed and began experiencing a seizure that reportedly lasted thirty seconds, after which she was taken to a local Los Angeles hospital for testing.
Split into simpler sentences: On 7 March 2013, while filming an episode of "Fashion Police", Osbourne collapsed and began experiencing a seizure that lasted thirty seconds. Osbourne was taken to a local Los Angeles hospital for testing.