Complex sentence: Glynne served as president of the American Society for Theatre Research from 1976 to 1999, and in 1970 his advice had been sought by Sam Wanamaker in 1970 on the setting up of Shakespeare's Globe.
Split into simpler sentences: Glynne served as president of the American Society for Theatre Research from 1976 to 1999. In 1970 his advice was sought by Sam Wanamaker on the setting up of Shakespeare's Globe.