Complex sentence: On 19 April, "Seraph" set sail, and on 30 April, arrived at a point about a mile off the coast of Spain, near the town of Huelva.
Split into simpler sentences: On 19 April, "Seraph" set sail. On 30 April, "Seraph" arrived at a point about a mile off the coast of Spain, near the town of Huelva.