Complex sentence: The Chief Executive is Andrew McCulloch, appointed in 2002, has described the main purpose of the Foundation as "to try to mainstream mental health as an issue so it is a core part of everything else".
Split into simpler sentences: The Chief Executive is Andrew McCulloch, appointed in 2002. He has described the main purpose of the Foundation as "to try to mainstream mental health as an issue so it is a core part of everything else".