The Nov. 17 fire destroyed the high school library and caused an estimated $1 million in damage.
On Monday, Judge Lyle Anderson ordered White to serve up to 15 years in prison for the second-degree felonies and up to five years for the third-degree felonies, according San Juan County Attorney Craig Halls. The sentences all were ordered to run concurrently.
The judge also ordered White to pay $1 million in restitution.
Stolzer was found incompetent to stand trial on the charges in April, and a judge sent him to the Utah State Hospital. He is set for a review hearing on July 22.
According to Blanding police records, White admitted to the break-ins and starting the two fires, telling the officers that he broke into the school because he was angry with school officials.
"Deven stated that he was upset with the school because when he was in school, he had an iPod stolen and the school wouldn't help him find who took it," an investigator wrote in his report.
Stolzer told that he wanted to break into the school to view his "mental" medical records. He added that it was White's idea to start the fires.
On Nov. 15, at least three small fires were started and officials later found books scattered throughout the high school library, according to Blanding police. Three classrooms, including two special education classrooms, were broken into and the file cabinets were pried open, according to police.
Stolzer allegedly told investigators that they broke into the ZLB building "for kicks" and that it was White's idea. According to a police report, White told the officers the break-ins were "an adrenaline rush."
"I've got to tell you, that was so much fun, but I'm not sure it was worth it," White allegedly said.