Simplify the following text for a Grade 10 native English-speaking person.
Original: Even so Triapitsyn decided to take revenge , which resulted in the execution of the surviving garrison and the slaughter of all but 122 Japanese civilians - in all around 700 Japanese died shortly .
Simplified: Triapitsyn decided to attack the remaining Japanese troops , which helped capture the Japanese garrison and deaths of all but 122 Japanese non-army members . In all , about 700 people died .