Complex sentence: The Chronicle of Henry of Livonia mentions Tharapita as the superior god of Oeselians (inhabitants of Saaremaa island), also well known to Vironian tribes in northern Estonia.
Split into simpler sentences: The Chronicle of Henry of Livonia mentions Tharapita as the superior god of Oeselians (inhabitants of Saaremaa island). Therapita was also well known to Vironian tribes in northern Estonia.