Wallace continued charting the Rio Negro for four years , collecting specimens and making notes on the peoples and languages he encountered as well as the geography , flora , and fauna .
Wallace continued charting the Amazon for four years , collecting specimens and making notes on the peoples , the languages , the geography , flora , and fauna .
Wallace continued charting the Amazon for four years , collecting specimens and making notes on the peoples , the languages , the geography , flora , and fauna .
Rewrite the sentence to be simpler: Wallace continued charting the Rio Negro for four years , collecting specimens and making notes on the peoples and languages he encountered as well as the geography , flora , and fauna . Output: