A Florida man was sentenced to two decades in prison on Wednesday for conspiring to train for an Islamic holy war or jihad and traveling to the Middle East intending to fight with an al-Qaida-affiliated group, according to court records.Shelton Thomas Bell, 21, pleaded guilty in March to conspiring to provide material support to terrorists.In a plea agreement announced in Jacksonville, he admitted to recruiting a juvenile to join a jihad. In September 2012, the two flew from Jacksonville to the Middle East, planning to go to Yemen to join the Ansar al-Sharia group.