I came back from Osaka to Chiba today for the first time in two weeks.
Today was the first time I have been back to Chiba from Osaka in two weeks.
ーI came back from Osaka to Chiba today for the first time in two weeks.
「今日大阪から千葉に２週間ぶりに帰ってきた」
for the first time in two weeks で「２週間ぶりに」
to come back from Osaka to Chiba で「大阪らか千葉に帰ってくる」
ーToday was the first time I have been back to Chiba from Osaka in two weeks.
「今日が２週間で大阪から千葉に帰ってきた最初の日です」＝「２週間ぶりに帰ってきた」
to be back to Chiba from Osaka で「大阪から千葉に戻ってくる」
ご参考まで！
カナダ 
