Student or Learner
"A court in Bangladesh issued a warrant for the arrest of a son of Khaleda Zia, who was a former prime minister, charging him with having organised a grenade attack that killed 24 people at a political rally in 2004. Sheikh Hasina, the apparent target of that attack and nemesis of Mrs Zia, is now prime minister."
"who was a prime minister" is indicating that "a son of Khaleda Zia" or "Khaleda Zia" is the prime minister?
You asked this question yesterday in a different thread, Please don't clog up the system with duplicate threads.