Complex sentence: On 23 August 1975, Pathet Lao forces entered Vientiane, the last city to be captured and the Phouma Government became effectively powerless for the next few months.
Split into simpler sentences: On 23 August 1975, Pathet Lao forces entered Vientiane, the last city to be captured. The Phouma Government became effectively powerless for the next few months.