1.Causative structure: "due to their sentimental value" uses a causative structure to explain the reason why adults find it difficult to part with old belongings, adding depth to the sentence.
2.Metaphor: "feel akin to erasing a part of their history" uses a metaphor to vividly describe the emotional impact of disposing of possessions, enhancing the expressiveness of the language.
3.Noun phrase as subject: "This deep emotional connection" serves as the subject of the sentence, using a complex noun phrase to describe the reason for the difficulty in letting go, showcasing advanced grammar skills.