Complex sentence: The length of cooking time determines the final flavor and texture, since the longer the roux is cooked before being added to the gumbo, the darker it becomes, the more prevelent the roux flavor will be.
Split into simpler sentences: The length of cooking time determines the final flavor and texture. The longer the roux is cooked before being added to the gumbo, the darker it becomes and the more prevelent the roux flavor will be.