Complex sentence: The archive stores documents on every business transaction of the company--from the very beginnings through the 1960s--as well as Count Zeppelin's correspondence from the time he conceived his airship-building project.
Split into simpler sentences: The archive stores documents on every business transaction of the company, from the very beginnings through the 1960s. It also includes Count Zeppelin's correspondence from the time he conceived his airship-building project.