How about these:
1. He enrolled in an advanced calculus class; however, he dropped it because he found it too difficult.
2. The tidal was a real disaster because it ruined the crops, destroyed several villagers, and caused many deaths.
3. Although analysts worked many hours on the computer program, they couldn’t find the cause of the problem. They finally gave up and went home.
4. Junk food is bad for your health, contains no vitamins, and damages your stomach; therefore, people shouldn’t eat it.
5. The lack of rainfall has caused a severe water shortage; consequently, people have to conserve water every day and think of new ways to reuse water. However, the situation is improving.
Are they good enough?
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Oh, I am one yet many.