Mohamed Taki Abdoulkarim, who had briefly serving as acting President

Ⓐ who had briefly serving as acting President in 1995, in winning the most votes in the first round, he eventually became : no verb for the main subject so Incorrect
Ⓑ having had served as acting President in 1995, in winning the most votes in the first round to became : No verb for the Independent clause so Incorrect
Ⓒ who, having briefly served as acting President in 1995, he won the most votes in the first round in becoming : Discontinuation due to he . Incorrect as who and He both are pronoun for a single noun so the last part of sentence doesn't make sense.
Ⓓ who having had served as acting President in 1995 and winning the most votes in the first round, became : I omitted this because the meaning was changed; the winning now modifies the noun.
Ⓔ who had briefly served as acting President in 1995, won the most votes in the first round to eventually become : the first part modfies the name and second part i.e. after the comma takes over as rest of the sentence , correct