Complex sentence: Since 1997, the pastor and head of staff of the church has been the Rev. Dr. John A. Dalles, who is also known as a hymn writer; his hymns are published in denominational hymnals in the USA, Canada and Australia.
Split into simpler sentences: Since 1997, the pastor and head of staff of the church has been the Reverend Dr. John A. Dalles, who is also known as a hymn writer. His hymns are published in denominational hymnals in the United States, Canada and Australia.