Complex sentence: The project was originally begun in 1954 by Lyman H. Butterfield who came up with a system of transcription, annotation and collation, informed by his experience at The Papers of Thomas Jefferson.
Split into simpler sentences: The project was originally begun in 1954 by Lyman H. Butterfield. Butterfield introduced a system of transcription, annotation and collation for the archive informed by his experience at The Papers of Thomas Jefferson.