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: since 1980 the senior pastor has been john piper.

SOLUTION: since 1980 the main pastor has been john piper.

PROBLEM: an organism that obtains carbon from organic compounds but obtains energy from light is called a photoheterotroph , while an organism that obtains carbon from organic compounds but obtains energy from the oxidation of inorganic compounds is termed a chemoheterotroph.

SOLUTION: an organism that obtains carbon from organic compounds but obtains energy from light is called a photoheterotroph. an organism that obtains carbon from organic compounds but obtains energy from the oxidation of inorganic compounds is termed a chemoheterotroph.

PROBLEM: finally in 1482 the order dispatched him to florence , the ‘ city of his destiny ’.

SOLUTION:
finally , in 1482 the order sent him to florence , the ' city of his destiny ..