Four other defendants received terms of one or two years, while three were found not guilty by a court in Zwolle in the central Netherlands.
Prosecutors had asked for eight years in jail for the two main accused and up to four years for the others.
The trial on charges of human trafficking and membership of a criminal organisation, opened in March.
Prosecutors said about 140 Nigerian girls brought by the gang into the Netherlands as asylum seekers disappeared from asylum centres in 2006 and 2007.
About a dozen of the girls were traced, while the rest were thought to have been forced into prostitution in Italy, Spain and France.
Most were minors at the time, their ages ranging from 16 to 23. The Netherlands allegedly served as a transit point for the girls, sent by the suspects from Nigeria with false identity papers and instructions for an asylum application.
“The suspects used voodoo to influence the girls,” said a prosecution statement.
“They had to give blood, nails or a piece of clothing and make a promise to a voodoo priest to repay the -debts- incurred for their travel to Europe” - between 30,000 euros (44,400 dollars) and 60,000 euros each.
“That means that they would have had to have forced sex about 3,000 times and give up the proceeds. In a foreign country, far from home, with no way out - living with the fear of going crazy or dying if they disobey their handlers,” said the statement.
The suspects were arrested in the Netherlands in October 2007 after an investigation by Dutch police in collaboration with Nigerian and some European counterparts.
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