Complex sentence: In 1917, when Riga was taken by German forces, the family returned, only to leave again in July 1919 for fear to relive the terror when Riga was occupied by Bolsheviks in January, and this time is for good.
Split into simpler sentences: In 1917, when Riga was taken by German forces, the family returned. Only to leave again in July 1919 for fear to relive the terror when Riga was occupied by Bolsheviks in January, and this time is for good.