Complex sentence: The first book she wrote and illustrated, Llama Llama Red Pajama received critical acclaim in 2005 and she has gone on to write other books in the Llama Llama series, which have all been "New York Times" bestsellers.
Split into simpler sentences: The first book she wrote and illustrated, "Llama Llama Red Pajama", received critical acclaim in 2005. She has written other books in the "Llama Llama" series, which have all been "New York Times" bestsellers.