>>11842546Slurring, as mentioned above, is the standard answer, but I think there are two more or less exactly opposite form of complexity:
Cognitive effort saving, and memory saving.
Cognitive effort saving complexity saves some cognitive effort by memorizing premade chunks of language, which latter get slurred, and create the first kind of complexity. English is full of the first kind: do not -> don't; going to -> gonna; some less obvious like 'how many', which many people seem to pronounce with a different vowel than 'many' alone.
Then there is the memory sparing type, which goes by splitting the words into more abstract parts, which are then reused with other vocabulary, which means that less needs to be memorized, at the cost of more cognitive effort needed for putting the agglutinative words together.
I think you couldn't find many languages that contain a lot of complexity of both kinds, it's usually one or the other.
