Complex sentence: Scanlon has also published important work on freedom of speech, equality, tolerance, foundations of contract law, human rights, conceptions of welfare, theories of justice, as well as on foundational questions in moral theory.
Split into simpler sentences: Scanlon has also published important work on freedom of speech, equality, tolerance, foundations of contract law, and human rights. He has published papers on freedom of expression, the nature of rights, conceptions of welfare, and theories of justice, as well as on foundational questions in moral theory.