Complex sentence: Gaius Memmius (died circa 49 BC, incorrectly called Gemellus, "The Twin"), Roman orator and poet, tribune of the people (66 BC), patron of Lucretius and acquaintance of Catullus and Helvius Cinna.
Split into simpler sentences: Gaius Memmius (died circa 49 BC, incorrectly called Gemellus, "The Twin") was a Roman orator and poet. He was Tribune of the Plebs (66 BC), patron of Lucretius and an acquaintance of Catullus and Helvius Cinna.