Complex sentence: The label on the seed packets identified them as a product of a chain of stores called Earl May, and an officer on the September call had noted the presence of contact information for an Earl May store in Olathe, Kansas in Green's address book.
Split into simpler sentences: The label on the seed packets identified them as a product of the Earl May chain of stores. An officer on that call found the presence of contact information for the Olathe, Kansas Earl May store in Green's address book.