Ple-Sen
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Even though I've played D&D, the expansion always seemed too complicated to me...
In all the expeditions held on HeroesWorld, the mechanics are an order of magnitude simpler than D&D, except for the process of calculating final stats. But that is actually easy to avoid.
Try to put less emphasis on mechanics, make it more schematic and simple
Not really. "Wordy" systems usually have a very specific slant that can only be called narrative with a great deal of strain. They are completely unsuitable for expeditions... well, except maybe for Axoth. Systems like FATE and FUDGE are also not an option — I've run them multiple times, but I don't recall a single case where anyone was satisfied, be it the player or the GM themselves.