This summary is not the rule. The rule text controls.
Sometimes a statement contains another statement inside it, and both are being offered to prove something is true. This is called "hearsay within hearsay," or double hearsay. A common example is a written report that quotes what someone else said.
This rule says that kind of layered statement can still be used as evidence, but only if every layer fits its own exception to the hearsay rule. It is not enough for just one part to qualify. Each statement inside the other has to independently meet the requirements for an exception before a court will allow it in.
For example, imagine a business record that includes a customer's comment. The business record itself might qualify under the business records exception. But the customer's comment inside it also needs its own valid reason to be let in, separate from the business record exception. If either layer fails to meet an exception, that part of the evidence cannot be used.