Complex sentence: The Polish term "Kresy", meaning "Outskirts" or "Borderlands", refers to a land adjacent to what Poles consider the historical eastern frontier of their country, today's western territories of Ukraine, Belarus and Lithuania.
Split into simpler sentences: The Polish term "Kresy", meaning "Outskirts" or "Borderlands", refers to a land adjacent to what Poles consider the historical eastern frontier of their country. That is today's western territories of Ukraine, Belarus and Lithuania.