This is one thing that I did not understand when I first went through it, I had no idea what a wordy sentence is because don't all sentences have words in them.
I thought about this for a while and it clicked... You can have a sentence without words! At this point I felt like a absolute genius. To my great disappointment (I felt really stupid), as I opened the lesson work I was that my brilliant thought, well it was very off.
Now wordy sentences actually contain unnecessary words, or you have to read something really long to only get a little bit of information out.
You can easily tell when your work is wordy if you don't feel it. Wordy sentences make you loose the meaning; you feel like the writer was just writing stuff, when you read it. The main problem is not the amount of words, but when the words used do not add any information or detail to the sentence.
Quick example:
Wordy: My father, as well as my brothers, sister and mother love long walks up mountains and across long distances to enjoy the lovely view, from the rocks and nature to the wide panoramic views on the tops of the mountains.
Better: My family enjoy hiking and it's scenery.
A huge problem with getting rid of wordy sentences is that often we remove way too much and all the meaning is also then lost. For this example one can clearly see that I have lost some key description and you can also not feel me in the writing. Never kill the expressive and richness of your writing, but also don't put your reader to sleep while he/she is looking for information while reading.
Even better:My family love going hiking for a few days as they get to see all the beautiful things nature has to offer.
Remember that there is not set rule about this. For me I just play around with the sentence a few times till I get something that sounds and feels right.
Just on a little side note for self improvement. I will be doing 1 push-up for every 1$ earned on my posts and will give a short feedback every day at the end of each post. As promised I will be doing 100 pushups, today, for yesterdays post. Any not done will carry onto the next day. 90 is carried over to the next day.