It used to be that people always went to Karaoke with other people, but nowadays people often go by themselves.
In the old days people always went to Karaoke in a group, but nowadays it's not uncommon for a person to go by himself.
ーIt used to be that people always went to Karaoke with other people, but nowadays people often go by themselves.
「みんな以前は他の人とカラオケに行ったものだけど、最近はよく一人で行く」
used to で「以前は〜したものだった」
to go to Karaoke with other people で「他の人たちとカラオケに行く」
nowadays で「最近は」
to go by oneself で「一人で行く」
ーIn the old days people always went to Karaoke in a group, but nowadays it's not uncommon for a person to go by himself.
「昔はみんなグループでカラオケに行ってたけど、最近は一人で行くのは珍しくない」
in the old days で「昔は」
in a group で「グループで」
uncommon で「珍しい・まれな」
ご参考まで！
カナダ 
