Complex sentence: In February 1918, he was released from the internment camp in Beniaminów and joined the Polnische Wehrmacht, and after the establishment of the newly independent Poland, he joined the Polish Army.
Split into simpler sentences: In February 1918, he was released from the internment camp in Beniaminów and joined the Polnische Wehrmacht. After the establishment of the newly independent Poland, he joined the Polish Army.