Al-Tabarsi typically divides his commentary for each passage into five distinct sections: introductory discourse, reading guide (qira'at), language and grammar discourse, revelation circumstances (asbab al-nuzul), and the final meaning. English PDF and Translation Status
For those specifically seeking "Majma' al-Bayan" in English, it is often best to search for specific volumes or academic papers that translate the commentary for particular Surahs. Majma 39- Al-bayan English Pdf
For those looking for the original Arabic text or scholarly introductions in English, the Internet Archive and NYU Digital Library host high-resolution PDF scans of classical editions. Distinguishing from "Al-Bayan" by Al-Khoei Al-Tabarsi typically divides his commentary for each passage