Complex sentence: The English term "Old Frankish" is often rather unclearly used (including in this article) to refer to what should properly be called "Old Low Franconian", "Old West Low Franconian" or, more commonly, "Old Dutch".
Split into simpler sentences: The English term "Old Frankish" is often rather unclearly used (including in this article) to refer to what should properly be called "Old Franconian". However, because the term Old Frankish is usually used to refer to a variety of Old Franconian called "Old Low Franconian" or, more commonly, "Old Dutch".