Complex sentence: The Second Circuit Appeals court observed that a biographer may copy facts from an unpublished letter without risk but has no inherent right to copy the author's protected expression from such a letter, even as a means of illustrating the author's style.
Split into simpler sentences: The Second Circuit Appeals court observed that a biographer may copy facts from an unpublished letter without risk. However, he has no inherent right to copy the author's expression from such a letter, even as a means of illustrating the author's style.