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: while there he meets a young half-black boy by the name of arthur stuart , the son of a slave and a slave-owner who has been adopted by the owners of the local guesthouse.

SOLUTION: while he meets a young half-black boy arthur stuart , the son of a slave and a slave-owner who has been adopted by the owners.

PROBLEM: the centrepiece is cathedral cave with the massive altar rock.

SOLUTION: the centerpiece is cathedral cave with the huge altar rock.

PROBLEM: given their low metabolic rate and the low density of prey at such depths , vampire squid must use innovative predator avoidance tactics in order to conserve energy.

SOLUTION:
given their low metabolic rate and the low density of prey at such depths , vampire squid must use predator avoidance tactics in order to save energy.