I have acquired a desire to read Brihadaranyaka Upanishad, but I do not read Sanskrit and I do not know which translations should be trusted. What are high quality translations of the Brihadaranyaka Upanishad?
This translation would be useful https://www.holybooks.com/wp-content/uploads/Brihadaranyaka-Upanishad.pdf
Prof: S Kuppuswami Sastri's introduction begins like this:
This link would be helpful to know more about Prof: S Kuppuswami Sastri http://worldcat.org/identities/lccn-n50067203/
Another useful translation is here: https://www.consciouslivingfoundation.org/ebooks/13/CLF-brihadaranyaka_upanishad.pdf
About the translator: https://en.wikipedia.org/wiki/Swami_Nikhilananda
Any second hand language has limitations to exactly and accurately translate the eternal meaning of the upnishadas (vedas).
Any language has the four aspects of material errors (limitations), namely, "bhrama", "pramada", "vipralipsa"& "karnapatava".
The Vedas and Upnishadas only are beyond these four errors.
We have gone through almost every translations available in the English, however, the best we found in the translated versions of Jagatguru Kripaluji's lectures in Vrindavan (Mathura, UP). The selected verses of the upnishadas we also found in the translations and purports by Srila A.C. Bhakti Vedanta Swami Prabhupada in ISKCON BBT Books.
The book form of the upnishada in english is also available with the Central Chinmaya Mission Trust, Mumbai. Adiguru Shankaracharya had said to a sanskrit scholar of varanasi, near the end of his life; "bhaj govindam, bhaj govindam, govindam bhaj moorkh/moodha mate..". His grace has explained all the Prime Upnishadas in his own style, however, in authoring the Gita-upnishada mahatmaya, he has said, "eko shastram devaki-putra gitam".
Best of luck !!