MR.Shashwath. Buy this book by Bose, you can learn to read smskrutha in two months. I f you a gggeetha with word to word translation from R.K.Mutt, in English, that coul be a lif time companion. You may also buy their works on Upanishads as individual books or as volumes of collections. All their publications are generally original text in devanagari and word to word translation. I would prefer to buy the English translashions.
Griffith has not provided anymtranslated material for two phrases highlighted in yellow. His translation for the idiom in green is ihot very appropriate. कर्ण्वन्तो विश्वमार्यम =kruNvantho vishvamaartam = Ariyanaise the world अराव्णः = araavNa: = lawless not godless . Ref. Dr. A.C.Bose