Complex sentence: In 1569, Spanish Navy succeeded in trapping the English fleet of Sir John Hawkins, including the young Francis Drake, at San Juan de Ulúa; the English barely succeeded in making their escape, a humiliating experience which affected Drake's later career.
Split into simpler sentences: In 1569, the Spanish Navy succeeded in trapping the English fleet of Sir John Hawkins, including the young Francis Drake, at San Juan de Ulúa. The English barely succeeded in making their escape, a humiliating experience which affected Drake's later career.