Complex sentence: Optionally, some recipes call for the addition of salt or lime into the red mixture which is used as a condiment or as a side dish, and which is sometimes substituted for fresh chilis.
Split into simpler sentences: Optionally, some recipes call for the addition of salt or lime into the red mixture. The mixture is used as a condiment or as a side dish, and can be substituted into any recipe calling for fresh chilis.