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... iuuenta incautiorem; certe stultius illum atque intemperantius eam quam...

Mind the pronouns: illum (that one = Masinissa) had married Sophoniba (eam) more foolishly and more...than he (se = Syphax) [had married her]." Duxisse, "to have led a woman into marriage, continuing the o. o. with Syphax speaking. Syphax's marriage to Sophoniba had caused him to join the Carthaginian side against the Romans; Masinssa's marriage had induced him to promise her he would not give Sophoniba up to the Romans.