TASK DEFINITION: In this task, you're given a sentence and your task is to generate a simplified sentence that focuses on lexical paraphrasing from the original sentence given in the input.
PROBLEM: it is one of the nine species of leaf-eating kangaroos identified in fossils found in the naracoorte caves national park.

SOLUTION: this is one of nine types of leaf eating kangaroos found in the naracoorte cave national park fossils.

PROBLEM: 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.

SOLUTION: after a version of a software package has remained unsteady for sometime , that package is automatically moved to the testing distribution.

PROBLEM: bernard haitink made his debut with the concertgebouw orchestra on 7 november 1956.

SOLUTION:
bernard haitink made his debut performance with the concertgebouw orchestra on 7 november 1956.