Complex sentence: The first Alessandri came to Chile in the 1800s and was named Giuseppe Pietro Alessandri Tarzi, consul posterior, of the Kingdom of Sardinia and Piedmonte.
Split into simpler sentences: The first Alessandri who came to Chile was named Giuseppe Pietro Alessandri Tarzi. He arrived in the 1800s and was later consul of the Kingdom of Sardinia and Piedmonte.