Detailed Instructions: 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:over 6,000 navvies were hired for up to two years building , blasting and clearing rubble beneath the south downs to create clayton tunnel.
Solution:
over 6,000 navvies were hired for up to two years building , blasting , and clearing rubble beneath the south downs to create clayton tunnel.