Complex sentence: Many of the classical Greek genres, such as drama and choral lyric poetry, had been obsolete by late antiquity, and all medieval literature in the Greek language was written in an archaizing style, which imitated the writers of ancient Greece.
Split into simpler sentences: Many of the classical Greek genres, such as drama and choral lyric poetry, had been obsolete by late antiquity. However, all medieval literature in the Greek language was written in an archaizing style, which imitated the writers of ancient Greece.