Use this script.
cat merchent.csv | cut -d "," -f2 | while read; do
IFS='. ' read -ra ADDR <<< "$REPLY"
for i in "${ADDR[@]}"; do
# process "$i"
echo -ne "$i "
done
echo " "
done
Here I'm guessing your data is like
business_name1,contact_name1(in the format Mr. John Doe),email_address1
business_name2,contact_name2(in the format Mr. John Doe),email_address2