Complex sentence: Morgoth was finally captured cowering in the deepest dungeon of Angband and bound again with the chain Angainor; the two Silmarils still in his possession were taken by the Maia Eönwë, the herald of Manwë.
Split into simpler sentences: Morgoth was finally captured cowering in the deepest dungeon of Angband and bound again with the chain Angainor. The two Silmarils still in his possession were taken by the Maia Eönwë, the herald of Manwë.