The difference in meaning between two simple sentences and one compound sentence is very subtle, but a difference does exist. Two sentences do not imply quite the same strength of connection between the ideas as their combining implies in a compound sentence. Each separate sentence expresses one, single, independent idea. Two separate sentences lying next to each other have obvious connection merely because they appear next to each other in the same context. On the other hand, when they are joined with a semicolon or with a comma and a coordinating conjunction, the connection between the ideas expressed is much closer.
Experienced writers sense the difference and make use of it.
Now you are going to add further sophistication and variety to your sentences with verbal phrases. Using verbal phrases skillfully gives your writing variety. That last sentence used a verbal phrase. Using verbal phrases skillfully is a verbal phrase. Using verbal phrases skillfully is the subject of the predicate gives.