What is the relationship between the complexity of organisms from the five kingdoms and their time of appearance on Earth?

In terms of complexity and their time on Earth, the kingdom hierarchy would be: Monera ⇒ Protista ⇒ Fungi ⇒ Plantae ⇒ Animalia. Monera are unicellular (ie. not complex) and are the eldest, while Animalia are multicellular and the youngest.