Original sentence: From the time of Vancouver's first non-indigenous settlement in the second half of the 19th century, people from the British Isles were the largest group of immigrants and, collectively, remain the largest ethnic grouping in Vancouver to this day
Edited sentence: From the time of Vancouver's first non-indigenous settlement in the second half of the 19th century, people from Britain and Ireland were the largest group of immigrants and, collectively, remain the largest ethnic grouping in Vancouver to this day