You will be given a definition of a task first, then some input of the task.
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.

david w. dunham , the minor planet bulletin , volume 6 , p.13-14 -lrb- december 1978 -rrb- ads archive copy however , careful examination in 1993 , using the hubble space telescope , failed to locate a secondary.
Output:
careful examination in 1993 , using the hubble space telescope , failed to locate a secondary.