Complex sentence: On 2 April 1982 Argentina invaded the Falkland Islands and three days later a naval task force headed by "Invincible" and "Hermes" left Portsmouth bound for the South Atlantic.
Split into simpler sentences: On 2 April 1982 Argentina invaded the Falkland Islands. On 5 April 1982 a naval task force headed by "Invincible" and "Hermes" left Portsmouth bound for the South Atlantic.