Complex sentence: About 20 Venoms continue to fly as of 2004, performing at various air shows, while a number of examples are preserved in museums in the United Kingdom and abroad, in non-flying, static display condition.
Split into simpler sentences: About 20 Venoms continue to fly as of 2004, flying at various air shows. There are a number of Venoms preserved in museums in the United Kingdom and abroad, in non-flying, static display condition.