I started studying at DMM again today for the first time in two years.
My last lesson at DMM was two years ago, but I resumed my studies again today.
ーI started studying at DMM again today for the first time in two years.
「今日またDMMで二年ぶりに勉強を始めた」
for the first time in two years で「二年ぶりに」
to start studying again で「勉強を再開する」
ーMy last lesson at DMM was two years ago, but I resumed my studies again today.
「DMMでの最後のレッスンは二年前だったが、今日また勉強を再開した」
to resume で「再び始める」
ご参考まで！
カナダ 
