Complex sentence: Richard left for Spain, Portugal, and France (1783--84, quitting his parliamentary seat after his departure) and then wintered in Rome before leaving there in February 1785 for the Levant with Willey Reveley as draughtsman.
Split into simpler sentences: Richard left for Spain, Portugal, and France (1783--84, quitting his parliamentary seat after his departure) and then wintered in Rome. In February 1785 he left Rome for the Levant with Willey Reveley as draughtsman.