Complex sentence: Each corpus contains one million words in 500 texts á 2000 words, which follows the methodology used for the "Brown University Corpus of Present-Day American English" (Brown Corpus).
Split into simpler sentences: Each corpus contains one million words in 500 texts á 2000 words. The design is, in principle, based on the methodology used for the "Brown University Corpus of Present-Day American English" (Brown Corpus).