Complex sentence: Classically the wish provider is often a spirit, jinni or similar entity, bound or constrained within a commonplace object (Aladdin's oil lamp for example) or a container closed with Solomon's seal.
Split into simpler sentences: Classically the wish provider is typically a spirit, jinni or similar entity. The entity is bound or constrained within an commonplace object (Aladdin's oil lamp for example) or a container closed with Solomon's seal.