Complex sentence: It was on this seaboard that she found herself when war was declared in Europe in August 1914 and, conforming to pre-war plans, she was summoned to duty in the German Imperial Navy.
Split into simpler sentences: It was on this seaboard that she found herself when war was declared in Europe in August 1914. Conforming to pre-war plans, she was summoned to duty in the German Imperial Navy.