Complex sentence: In 1976 Trungpa had named the Vajra Regent Ösel Tendzin (born Thomas Rich) his Buddhist (religious) lineage holder, and in 1979 his son Osel Mukpo (Sakyong Mipham) as his Shambhala (secular) heir.
Split into simpler sentences: In 1976 Trungpa had named the Vajra Regent Ösel Tendzin (born Thomas Rich) his Buddhist (religious) lineage holder. In 1979 his Trungpa's son, Ösel Mukpo (Sakyong Mipham), was named as his Shambhala (secular) heir.