A long complicated sentence should force itself upon you, make you know yourself knowing it. —Gertrude Stein
Writers are often advised to introduce the main verb of a sentence early. It’s generally good advice. Delaying the verb by prefacing it with subordinate clauses, adjuncts, participle phrases and assorted throat-clearing puts a cognitive load on readers. They must hold it all in their short-term memory until the verb arrives and they find out what frame the extra information fits into.
This is a particular problem in nonfiction prose, where communicating facts is a primary aim. I see it regularly in texts I edit: long lists and unpredictable subclauses pile up before I learn what the sentence is even about. With a little rearrangement the main verb can be brought forward, and the point is made much more direct and comprehensible.
Posted by Stan Carey 
Sentence first 