The term 'difficult to analyze or understand' can be summarized by two crossword solutions: ASSAY and PARSE. ASSAY is a noun that refers to the testing of a substance to determine its composition or quality. It is often used in the context of scientific experiments, such as chemical or biological assays. PARSE is a verb that means to break down a sentence into its component parts in order to analyze its structure and meaning. It is commonly used in linguistics and computer programming. Both ASSAY and PARSE are useful tools for understanding complex information.