"Some people sometimes tip David Lammay as our first black prime minister" is the active form of the idea. Here "David Lammay" is the direct object and "our first black prime minister" is an object complement. But when the passive form is made from that active form (by means of the usual process of making the direct object the subject), we have "David Lammay is sometimes tipped as our first black prime minister (by some people)".
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