Is these sentences are correct.
Debbie felt nervous and out-of-place at the party so she sat by herself at the end of the sofa.
She didn’t want people to feel sorry for her so she kept a strained smile on her face.
Again, you have written two sentences instead of one, and neither is a compound-complex sentence. Are you clear on the meaning of "compound-complex"?
My question is this: Do you have to combine those original 4 into 1 long sentence? Or is it OK to combine the 4 so they make up 2 sentences?
These are also fine, given the instructions you posted above.
Yes, the sentences are correct. They are grammatically sound and communicate the intended meaning clearly. However, if you want to confirm your answer, you can always follow these steps:
1. Check for subject-verb agreement: Ensure that the subjects and verbs in the sentences match in number and person. In this case, there is a singular subject ("Debbie") and a corresponding singular verb form ("felt" and "sat").
2. Ensure proper use of connecting words: Look for any coordinating conjunctions (such as "and" in this case) and ensure they are used correctly to connect the different elements in the sentence.
3. Verify the accuracy of adjectives and adverbs: Make sure that the adjectives and adverbs used in the sentences accurately describe the nouns and verbs they modify. In this case, "nervous" and "out-of-place" describe how Debbie felt, and "strained" describes the smile she kept.
By following these steps, you can analyze the sentences from a grammatical perspective and confirm their correctness.