Complex sentence: The city was founded on April 22,1819 by French and Spanish settlers (under the command of Don Luis De Clouet y Favrot) in a bay, which served as a refuge for pirates and privateers.
Split into simpler sentences: The city was founded on April 22,1819 by French and Spanish settlers under the command of Don Luis De Clouet y Favrot. At the time of settlement, the bay which the town is located by, served as a refuge for pirates and privateers.