Complex sentence: I believe it's based on the Mali, West African, folklore which has been made well-known by Esphyr Slobodkina's retelling, which she calls Caps for Sale (A Tale of a Peddler, Some Monkeys and Their Monkey Business).
Split into simpler sentences: I believe it's based on the Mali, West African, folklore which has been made well known By Esphyr Slobodkina's retelling. Which she calls Caps for Sale (A tale of a Peddler some Monkey's and their Monkey Business).