Complex sentence: In order to protect their lucrative business against piracy, Denmark-Norway had secured a peace deal with the states of Barbary Coast, involving the payment an annual tribute to the individual rulers of those states and additionally to the United States.
Split into simpler sentences: In order to protect the lucrative business against piracy, Denmark-Norway had secured a peace deal with the states of Barbary Coast. It involved paying an annual tribute to the individual rulers and additionally to the United States.