Complex sentence: Their language is usually highly formalized, and they make extensive use of mnemotechnical Mnemotechnics devices such as alliteration, and for a number of archaic words and formulas some thulas are the only available source.
Split into simpler sentences: Their language is usually highly formalized, and they make extensive use of mnemonic devices such as alliteration. For a number of archaic words and formulas some thulas are the only available source.