Complex sentence: It was also at this paper that he began a close collaboration with Petre Locusteanu, with whom he founded "Flacăra", a weekly literature and current events magazine, which first appeared from 1911 to 1916.
Split into simpler sentences: It was also at this paper that he began a close collaboration with Petre Locusteanu. In 1911, Banu and Locusteanu founded "Flacăra", a weekly literature and current events magazine, which first appeared from 1911 to 1916.