Complex sentence: The National Academies Press is the publisher for the National Academies of Sciences, Engineering, and Medicine, and makes its publications available for free online reading, and the full book PDFs have been available for free download since 2011.
Split into simpler sentences: The National Academies Press is the publisher for the National Academies of Sciences, Engineering, and Medicine, and makes its publications available for free online reading. All full book PDFs have been available for free download since 2011.