Complex sentence: On 1 June 1963, Kenyatta became prime minister of the autonomous Kenyan government, with Queen Elizabeth II remaining as Head of State (after Independence, styled as "Queen of Kenya"), represented by a Governor-General.
Split into simpler sentences: On 1 June 1963, Kenyatta became prime minister of the autonomous Kenyan government. After independence, Queen Elizabeth II remained as Head of State (after Independence, styled as "Queen of Kenya"), represented by a Governor-General.