Complex sentence: Tiberius Sempronius Gracchus attempted to address some of these violations in 133 BC, which led to much redistriubtion of the land, while a similar move by his brother Gaius Sempronius Gracchus in 123 BC failed because of his death the following year.
Split into simpler sentences: Tiberius Sempronius Gracchus attempted to address some of these violations in 133 BC, which led to much redistribution of the land. A similar move by his brother Gaius Sempronius Gracchus in 123 BC failed because of his death the following year.