Complex sentence: In 2002, the institution received a another gift from Roy Eddleman, founder of Spectrum Laboratories, whose collection contained paintings from the 17th, 18th, and 19th centuries.
Split into simpler sentences: In 2002, the institution received a another gift from Roy Eddleman, founder of Spectrum Laboratories. The collection contained paintings from the 17th, 18th, and 19th centuries.