Complex sentence: After its premiere on April 18,2007 at Robert De Niro's sixth annual Tribeca Film Festival, the film enjoyed a limited theatrical run in several US cities in 2007 and was purchased for broadcast beginning March 25,2008 by HBO.
Split into simpler sentences: After its premiere on April 18,2007 at Robert De Niro's sixth annual Tribeca Film Festival, the film enjoyed a limited theatrical run in several US cities in 2007. The film was purchased for broadcast beginning March 25,2008 by HBO.