Complex sentence: His birth name is widely perceived to be Fred Phillips, although on different documents he is also credited as Fred Demaree or Stewart, while his biological parents were Luther and Olive Phillips (the latter of which was also credited under the Demaree and Stewart surnames).
Split into simpler sentences: His birth name is widely perceived to be Fred Phillips, although on different documents, he is also credited as Fred Demaree or Stewart. His biological parents were Luther and Olive Phillips (the latter of which, was also credited under the Demaree and Stewart surnames).