Complex sentence: Born as Giuseppi Bonomi in Rome, he made his early reputation there, then moved to London in 1767 where he was employed as a draughtsman from 1768 until 1781 in the practice of Robert and James Adam before setting up his own business.
Split into simpler sentences: Born as Giuseppi Bonomi in Rome, he made his early reputation there, then moved to London in 1767. He worked from 1768 until 1781 in the practice of Robert and James Adam before setting up his own business.