Complex sentence: The Admiralty gave Beaufort his first ship command, HMS "Woolwich", with the task of conducting a hydrographic survey of the Rio de la Plata estuary in South America.
Split into simpler sentences: The Admiralty gave Beaufort his first ship command, HMS "Woolwich". Then the Admiralty tasked him with of conducting a hydrographic survey of the Rio de la Plata estuary in South America.