Complex sentence: The following morning they were joined by "Emerald" and the 18-gun sloop, "Osprey" and by 11:00, the squadron was anchored in Choc Bay.
Split into simpler sentences: The following morning they were "Emerald" and the 18-gun sloop, "Osprey" had joined them. By 11:00, the squadron was anchored in Choc Bay.