Complex sentence: Patriation resulted in the Constitution of Canada being legally amendable by Canada only, and only according to the Constitution of Canada amending formula, with absolutely no enacting role for the Parliament of the United Kingdom.
Split into simpler sentences: Patriation resulted in the Constitution of Canada being legally amendable by Canada only. Such amendment could only be done pursuant to and in accordance with the Constitution of Canada amending formula--with absolutely no enacting role of the Parliament of the United Kingdom.