I am having a hard time deciphering the phrase, which I came across in a local magazine. Does it mean the person
started out as a singer and switched careers one by one to finally become a politician? (mostly think this is correct)
started as a politician but is now a singer? (not in favor of this option)
juggles all 4 roles, simultaneously?(politician for a few months, actor for a few months..see below example for my dilemma)
I searched online(Image Search) for "singer turned actor" and one of the prominent results was that of Justin Timberlake. As far as I understand, he was a singer first, ventured into acting later, but he does both singing and acting at present, doesn't he? Or am I getting confused with a rather simple usage?
Also I would like to know what these type of phrases (A-turned-B-turned-C) are known in English(if there exists an established term).