Complex sentence: Cooky Sirico, born 2 February, was a Delron from 1969-1973, after which the group became inactive and she became a secretary at a brokerage stock cage.
Split into simpler sentences: Cooky Sirico, born 2 February, was a Delron first from 1969-1973. When the live group became inactive in 1973, she became a secretary at a brokerage stock cage.