Ok i think i can clear some of this up. All we have to do is put Two and Two together. To answer the qustion "Was Jim Henson a full blown "hippy" I can say with a 100% ceartnty that in some ways he was and other ways he wasnt. You have to think one Of his close frineds was John Denver who was really into peace and taking care of the earth giving back to it (Some who probly say "Treehugger") and in that way i would say he was a hippy becaues that is what i think they where really all about. But a lot of Hippys where Drug users and i just dont think a busy person with so much riding on his carrer of the muppets and SS, that i really dont think he would be involed with drugs.
As for him and Jane being Sperated, Carol Spinny (Voice of Big Bird and Oscar the Grouch From 1969 to today) Says in his Book that they where seperated and jim would Try and date other ladies but never could really go through it becaues he loved Jane. There was no big argument or anything like that let just would seperatre they always loved each other. Read the Book
Hope this helps.