najapa,
Less is more has to do with saying the same thing but with fewer words. A logline does need certain details, but if you can say those details in 20 words instead of 40 it's better.
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For instance. Some people will say "Young boy" in describing a character. However boys are young by nature so all you need to say is "Boy" thus getting the point across in one word instead of two.
Sam searches for clues
Sam investigates.
James falls in love with Anne
James falls for Anne
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Sometimes you can do this by dropping details that are unimportant, such as.
While taking a walk in the woods, a homeless vet finds a backpack full of money.
A homeless vet finds a backpack full of money.
You see, what is important is that he found the backpack not what he was doing leading up to finding the backpack.
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The good thing is, as you practice tightening loglines you find it improves your script writing as well.
Anyway hope that helps.