Complex sentence: In 1964, after being co-founding technical director of Telectronics Pty Ltd in 1963, the company was invited to participate in artificial cardiac pacemaker research in which co-founder Noel Gray and he made significant contributions.
Split into simpler sentences: In 1964, after being co-founding technical director of Telectronics Pty. Ltd. in 1963, the company was invited to participate in artificial cardiac pacemaker research in which co-founder Noel Gray and he made significant contributions.