Complex sentence: After the town was transferred to the Second Polish Republic in 1920 following the Treaty of Versailles, and officially became Tuchola, the POW camp became known as Camp No.7.
Split into simpler sentences: After the town was transferred to the Second Polish Republic in 1920 following the Treaty of Versailles, and officially became Tuchola. Under Polish administration the POW camp became known as Camp No.7.