Subordinate clauses.

Now that the citizens have ignored the warnings, the ecology of the planet will collapse.
Before the planets ecology collapsed, all hope was not yet lost.
If all hope is lost, the Thames will run dry.
Since all hope was lost, the citizens began to ignore the warnings.
The ecology of the planet had collapsed, though hope was yet lost.

It was a bright cold day in April. The clocks were striking thirteen. Winston Smith had his chin in his breast. It was in an effort to escape a vile, windy day. Winston Smith walked through the doors of Victory Mansions. But wasn’t quick enough. A swirl of gritty dust got through the door too.
(This is that entire paragraph, hopefully converted to simple sentences.)

Though Winston Smith, has chin nuzzled into his breast in an effort to escape the wind, walked through the doors of victory mansion at a quick speed, he couldn’t prevent a swirl of gritty dust from getting in. (How do I not rewrite it?)

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