Interested in Language
According to Interstudy， a nonprofit organization that studies health maintenance organizations（HMO's）， only 36 percent of the nation's 607 HMO's were profitable last year； it estimates that this year 73 percent will be.
1) I have never seen the word Interstudy, and what's the meaning of Interstuday?
2) I have meditated the structure of sentence for a while, and at first I cannot understand it.
Now I feel the red part is the appositive of HMO's. Is my opinion right?
Interstudy is the name of an organisation. It is a nonprofit organization that studies health maintenance organizations（HMO's）.
The parts in red are the main clauses of the sentence. The words are what Interstudy has reported.