Sure! Here are the classifications for each of the sentences you provided:
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The garbage piled up to the ceiling.
- Simple
-
Alicia lived in the city, and one of her cousins lived in the country.
- Compound
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Although it was a holiday, Sheena worked on her science assignment.
- Complex
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Our tour guide showed us the house, and she demonstrated cooking on a cast iron stove.
- Compound
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The train that chugs along the tracks passes by a river, but it does not go through a tunnel.
- Compound-complex
-
The ducks and geese flew south.
- Simple
-
Although the tree squirrel is a wonderful acrobat, it sometimes misses its mark.
- Complex
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The cats are playmates, and both are good mouse hunters.
- Compound
-
Tree squirrels, who are omnivores, can eat almost anything.
- Complex
-
Mr. Gleason runs a pet store, and his two children help him.
- Compound
Let me know if you need further assistance!