Complex sentence: Thomas Ian Porter (8 December 190622 September 1989) who was known by his second given name, Ian, or by his initials, TIP, was an Australian commercial artist whose design archive is held by the Powerhouse Museum in Sydney.
Split into simpler sentences: Thomas Ian Porter (8 December 190622 September 1989) was an Australian commercial artist. His design archive is held by the Powerhouse Museum in Sydney.