Complex sentence: The 77th Division is also known as the "liberty" division due to the Statue of Liberty emblem the group picked out for themselves, but they were usually referred to as the "Metropolitan" division because of where most of the men hailed from.
Split into simpler sentences: The 77th Division is also known by other nicknames such as the "liberty" division which was due to the Statue of Liberty emblem the group picked out for themselves. However, they were mostly referred to as the "Metropolitan" division because of where most of the men hailed from.