Complex sentence: The Nick Jr. channel also retained the Noggin mascots Moose A. Moose and Zee until February 29,2012, although it still didn't air commercials and marginalize closing credits for promotion of other shows.
Split into simpler sentences: The Nick Jr. network retained the Noggin mascots Moose A. Moose and Zee until February 29,2012. Like Noggin, the network does not air commercials or marginalize closing credits for promotion of other shows.