Complex sentence: The pair travelled over 2,250 km (1,400 mi) throughout Amazonian basin, the richest palm region in the world, collecting and sketching specimens, beginning in Rio de Janeiro and Sao Paulo before making their way north and inland.
Split into simpler sentences: The pair travelled over 2,250 km (1,400 mi) throughout the Amazon basin, the most species-rich palm region in the world, collecting and sketching specimens. They began in Rio de Janeiro and Sao Paulo before making their way north and inland.