Complex sentence: For the next 300 years and by the year 700, the entire Iberian Peninsula was ruled by Visigoths, having survived until 711, when King Roderic (Rodrigo) was killed while opposing a Moorish invasion from the south.
Split into simpler sentences: For the next 300 years and by the year 700, the entire Iberian Peninsula was ruled by the Visigoths. This period lasted until 711, when King Roderic (Rodrigo) was killed while opposing a Moorish invasion from the south.