Original: The Royal Society of London for the Improvement of Natural Knowledge, known simply as the Royal Society, or even the Royal, is a learned society for science that was founded in 1660  and is considered by most to be the oldest such society still in existence.
Simplified: The Royal Society of London for the Improvement of Natural Knowledge, known also as The Royal Society, is a learned society for science that was founded in 1660 and is the oldest  society of its kind still in existence.