Complex sentence: He was the first European to see the magnificent waterfall on the Zambezi River in 1855, naming them "Victoria Falls" after Queen Victoria--he described them thus: "Scenes so lovely must have been gazed upon by angels in their flight".
Split into simpler sentences: He was the first European to see the magnificent waterfalls on the Zambezi River in 1855, naming them "Victoria Falls" after Queen Victoria. He described them thus: "Scenes so lovely must have been gazed upon by angels in their flight".