I am studying sentence types and I came across this sentence apparently begin simple.
How is this a simple sentence?

"Nobel Peace Prize winner Nelson Mandela campaigned for social equality in South Africa and later became the country's first democratically elected black president."

Isn't the first half "Nobel Peace Prize winner Nelson Mandela campaigned for social equality in South Africa" a independent clause and "became the country's first democratically elected black president" a dependent, making this a complex sentence?

Please explain why