Complex sentence: In 1968, when the New York building they were renting was put up for sale, Sun Ra and the Arkestra relocated to the Germantown section of Philadelphia, where his Morton Street house remained the Arkestra's base of operations until Sun Ra's death.
Split into simpler sentences: In 1968, when the New York building they were renting was put up for sale, Sun Ra and the Arkestra relocated to the Germantown section of Philadelphia. He got a house in Morton Street that became the Arkestra's base of operations until Sun Ra's death.