Complex sentence: Harry Smith was born in Portland, Oregon, and grew up in and around Seattle, Washington, to parents who were Theosophists with Pantheistic tendencies (involving the belief in an immanent God, who is identical with the Universe or nature).
Split into simpler sentences: Harry Smith was born in Portland, Oregon, and grew up in and around Seattle, Washington. His parents were Theosophists with Pantheistic tendencies (involving the belief in an immanent God who is identical with the Universe or nature).