Complex sentence: The sausage used must be of the unspiced English pork variety since, a sausage butty made with continental style smoked or spiced sausages would taste more like a Hot Dog and certainly wouldn't be recognised by English people as a' sausage butty'.
Split into simpler sentences: The sausage used must be of the unspiced English pork variety. A sausage butty made with continental style smoked or spiced sausages would taste more like a Hot Dog and certainly wouldn't be recognised by English people as a' sausage butty'.