In at least one of the products tested, levels of lead and/or cadmium were available on the product surface even before we began the simulated sunlight exposure tests.
(the products; tested; ) (levels of lead and/or cadmium; were; available on the product surface; T:even before we began the simulated sunlight exposure tests; L:In at least one of the products)
the products levels of lead and/or cadmium
tested were
available on the product surface T:even before we began the simulated sunlight exposure tests L:In at least one of the products