Without knowing exactly what the "car parking problem" is, I can't specifically tailor the answer to the question. It is possible that the prompt is simply asking you to make up a problem, write about it, and meet the grammatical constraints. It might be kind of fun to do this in a business letter format in which you address a problem, suggest a solution, and request the company to take some kind of action. This format would easily allow you to correctly incorporate "whom" because it could be your letter's salutation.
"To Whom It May Concern:"
If it is a letter of complaint, you could start out fairly angry. "I don't know who thought of arranging the parking lot in its current configuration."
The past participle of "to drive" is "driven." You could include a sentence that talks about your driving experiences in the parking lot. "I have driven my car in this parking lot for 9 months." That kind of sentence would allow you to get into your specific complaint. The semicolon and transition word is easily handled by correctly using "however."
"I realize that I have stated multiple complaints; however, I would like to offer a solution."
For a sentence with a direct and indirect object, be sure to stay in the active voice. Since you are writing a letter to someone presumably higher "up the chain," you could write a sentence about a previous letter that you wrote or gave someone. "I gave the parking security guard a similar letter, but nothing happened."
The above sentences work to fulfill the grammatical requirements of your letter, but it is up to you to adjust and rewrite them in a manner that makes the letter make sense. Additionally, be sure to address what the problem is and offer your suggested fixes.