Question: in the 1979–80 NBA season, Philadelphia 76ers acquired a guard from the Portland Trail Blazers who has recently served as a head coach of which NBA team ?
Sentence (from "1979–80 Philadelphia 76ers season"): The team had acquired guard Lionel Hollins from the Portland Trail Blazers after their effort to obtain Pete Maravich failed as he signed with the Boston Celtics.
Relevant evidence: Yes