Complex sentence: With the beginning of the Second World War in 1939, many new laws and prohibitions were established in Nazi Germany, forcing the population to decide whether to obey the Nazi regime or to risk being declared "criminals".
Split into simpler sentences: With the beginning of the Second World War in 1939, many new laws and prohibitions were established in Nazi Germany. This forced the population to decide whether to obey the Nazi regime, or to risk being declared "criminals".