Complex sentence: A separate pumpernickel tradition has developed in North America, where the loaf color approximates the dark color of traditional German pumpernickel by adding molasses, coffee, cocoa powder, or other darkening agents.
Split into simpler sentences: A separate pumpernickel tradition has developed in North America. The North American pumpernickel loaf approximates the dark color of traditional German pumpernickel by adding molasses, coffee, cocoa powder, or other darkening agents.