Complex sentence: Historically, the position of Secretary-General is not considered for the Prime Ministerial post, instead the Central Executive Committee hold a election, to choose between Lee Kuan Yew, SG of PAP or Ong Eng Guan, treasurer of the PAP.
Split into simpler sentences: Historically, the position of Secretary-General is not considered for the post of Prime Minister, instead the Central Executive Committee hold an election to choose the Prime Minister. It is a contest between Lee Kuan Yew, Secretary-General of PAP or Ong Eng Guan, treasurer of the PAP.