Complex sentence: On 19 August AD 14, Augustus died while visiting the place of his father's death at Nola, and Tiberius--who was present alongside Livia at Augustus' deathbed--was named his heir.
Split into simpler sentences: On 19 August AD 14, Augustus died while visiting the place of his father's death at Nola. Tacitus "Annals" 1.5 Cassius Dio 55.22.2; 56.30 Tiberius, who was present alongside Livia at Augustus' deathbed, was named his heir.