Complex sentence: The Italian Jewish appeals brought the attention of Sir Moses Montefiore, the president of the Board of Deputies of British Jews, who was already well known for his willingness to travel great distances to help his co-religionists.
Split into simpler sentences: The Italian Jewish appeals brought the attention of Sir Moses Montefiore, the president of the Board of Deputies of British Jews. Montefiore was already well known for his willingness to travel great distances to help his co-religionists.