そういうわけで遅くなったのです。

such; like that; that sort of; very

conclusion from reasoning, judgement or calculation based on something read or heard; reason; cause; meaning; circumstances; situation

be; is; indicates past or completed action; indicates light imperative

slow; late (e.g. "late at night"); too late; dull; stupid

to become; to get; to grow; to be; to reach; to attain; to result in; to prove to be; to consist of; to be composed of; to succeed; to be complete; to change into; to be exchanged for; to play a role; to be promoted; to do ...

indicates possessive; nominalizes verbs and adjectives; substitutes for "ga" in subordinate phrases; (at sentence-end, falling tone) indicates a confident conclusion; (at sentence-end) indicates emotional emphasis; (at sentence-end, rising tone) indicates question

be; is