Complex sentence: Coptic Christians are the predominant members of Garbage City, which is well known for herding swine within the city, which are fed edible pieces of garbage and marketed across Cairo to Coptic Christian establishments.
Split into simpler sentences: Coptic Christians are the predominant members of Garbage City. The are well known for herding swine within the city, which are fed edible pieces of garbage and marketed across Cairo to Coptic Christian establishments.