Complex sentence: The Southern Netherlands (,,) were a part of the Low Countries controlled by Spain (Spanish Netherlands,, 1579--1713), Austria (Austrian Netherlands,, 1713--94) and annexed by France (1794--1815).
Split into simpler sentences: The Southern Netherlands (,,) were a part of the Low Countries controlled by Spain. During this period, the region was known alternately as "Spanish Netherlands" (1579--1713), Austria (1713--94) and captured by France (1794--1815).