The complexity of English spelling reflects the origin of the language as a trade tongue, also possibly reflecting influence from Latin, which went so far as to add redundant letters for the sole purpose of indicating foreignness. The majority of words are loanwords, and the spelling reflects the origin of the word (unless you're British, in which case some of the spelling reflects the British desire to be French). This can actually be very useful for divining pronunciation and meaning, but I admit I do sometimes think about dropping the redundant letters and reforming the alphabet to one sound per letter.