A。というのは B。(Toiu no wa~)

Kare wa hijou ni tsukareteimasu. To iu no wa, sakuya, kuruma de tooku made itte kita tame desu.

He is very tired. That is to say, because he went far by car last night.

Kono resutoran wa osusume desu. To iu no wa, ryouri ga oishii shi, fun'iki mo ii kara desu.

I recommend this restaurant. That is to say, because the food is delicious and the atmosphere is nice.

Shiken ni ochita. To iu no wa, juubun ni benkyou shinakatta kara desu.

I failed the exam. In other words, because I didn't study enough.

Kanojo wa dokutoku na shumi ga aru. To iu no wa, konchuu shuushuu da.

She has a unique hobby. Namely, insect collecting.