This particular use of 'still' means to an even greater degree or in an even greater amount.
One example of this usage from Cambridge dictionary is:
I'm worried that his car has broken down, or worse still, that he's had an accident.
So, the car breaking down is bad, but an accident is worse still - meaning it is bad to a greater degree than the first ...
 Sort [by extension].
 We came [by the back road].
In these examples "by" is a preposition functioning as head of the bracketed PPs (preposition phrases).
In  the PP is an adjunct expressing how something is to be sorted.
In  the PP is a complement of "came". PPs expressing path are complements because they
have to be ...
Soon it will be hell [to go outside].
This is an extraposition construction, where the dummy pronoun "it" is subject and the bracketed infinitival clause is extraposed subject, outside the verb phrase.
The basic (non-extraposed) version is
[To go outside] will soon be hell.
where this time the infinitival clause is subject.
Incidentally, I would ...
What you need is a parser and there are parsers online. https://www.link.cs.cmu.edu/link/submit-sentence-4.html
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my favourite.a sport.n is.v hiking.n
(S (NP My favourite sport)
However computers have ...