Complex sentence: Whitewall tires or white sidewall (WSW) tires are tires having a stripe or entire sidewall of white rubber that mainly lasted from the early 1900s to around the mid 1970s.
Split into simpler sentences: Whitewall tires or white sidewall (WSW) tires are tires having a stripe or entire sidewall of white rubber. These tires were most commonly used from the early 1900s to around the mid 1970s.