Complex sentence: This was followed by the signing of the Munich Agreement and the subsequent Nazi invasion of the Sudetenland in October 1938, and three weeks after "King Ottokar's Sceptre" finished serialisation, Germany invaded Poland.
Split into simpler sentences: This was followed by the signing of the Munich Agreement and the subsequent Nazi invasion of the Sudetenland in October 1938. Three weeks after "King Ottokar's Sceptre" finished serialisation, Germany invaded Poland.