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: manchester became the first city in the uk to acquire a modern light rail tram system when the manchester metrolink opened in 1992.

SOLUTION: manchester became the initial city in the uk to acquire a present light rail tram system when the manchester metrolink opened in 1992.

PROBLEM: in the canonical watson-crick base pairing , adenine -lrb- a -rrb- forms a base pair with thymine -lrb- t -rrb- , as does guanine -lrb- g -rrb- with cytosine -lrb- c -rrb- in dna.

SOLUTION: in the canonical watson-crick dna base pairing , adenine -lrb- a -rrb- forms a base pair with thymine -lrb- t -rrb- and guanine -lrb- g -rrb- forms a base pair with cytosine -lrb- c -rrb-.

PROBLEM: a change to this law had been considered until princess kiko gave birth to a son.

SOLUTION:
a law change had been considered until princess kiko had a son.