made up of many connected parts (and often difficult to understand or explain)

involved, intricate

many (uses, reasons etc); a machine part into which enter many pipes and exit one or two

abundant, many

of various kinds; having various qualities and characteristics

diversified, various

of various sorts, shapes etc

mixed, varied

having many parts or elements; a quantity which contains another quantity an exact number of times: '28 is multiple of 7'

diversified