Complex sentence: Toni is the daughter of Marie and Stefan Kowalcyk, a Polish miner from Wloszczowa, Poland who came to the Netherlands in 1948 to work in the coal mines after serving in the US Army in Germany.
Split into simpler sentences: Toni is the daughter of Marie and Stefan Kowalcyk. Stefan was a Polish miner from Wloszczowa, Poland who came to the Netherlands in 1948 to work in the coal mines after serving in the US Army in Germany.