Task: Text Simplification
Input (English): after a version of a software package has remained in unstable for a certain length of time -lrb- depending on the urgency of the software 's changes -rrb- , that package is automatically migrated to the testing distribution.
Output (English): after a version software package remained unstable for a certain period of time depending on the urgency of the software 's changes , and that package is automatically migrated to the testing destributi.