Complex sentence: On 26 April 1985, at about 18:00 pm, a group of prisoners rose in rebellion, when only two of 70 mujahideen were guarding the prison, while the others were gathered on the drill square to perform evening prayers ("namaz").
Split into simpler sentences: On 26 April 1985, at about 18:00 pm, a group of prisoners rose in rebellion. They began the uprising when only two of 70 mujahideen were guarding the prison; the others were gathered on the drill square to perform evening prayers ("namaz").