The smartphones have become widespread and things have become convenient for us in our lives.
However, there is an increase in the number of drivers who use their smartphone while driving.
I think that drivers who drive and use their smartphone at the same time are potential murderers.
ご質問ありがとうございます。
① "The smartphones have become widespread"＝「スマホが普及しました」
" and things have become convenient for us in our lives."＝「そして私たちの生活が便利になりました。」
"However, there is an increase in the number of drivers"=「しかし、運転者の数が増加しました」
"who use their smartphone while driving."＝「運転しながらスマホを使用する人が。」
② "I think that drivers who drive and use their smartphone at the same time are"=「運転者で運転とスマホを同時にする人達は」
"potential murderers."＝「潜在的な殺人者です。」
ご参考までに。
アメリカ合衆国 
