Complex sentence: They did not tell the Germans, and on 28 June German bombers appeared in the skies and bombed and strafed various places on both islands, including the harbours of Saint Peter Port and Saint Helier, killing 44 and wounding over 70 civilians.
Split into simpler sentences: They did not tell the Germans and on 28 June German bombers appeared in the skies and attacked both Islands. They bombed and strafed various places including the harbours of Saint Peter Port and Saint Helier killing 44 and wounding over 70 civilians.