Understanding complex sentence structures in the Reading section of the IELTS exam can be challenging, but with practice and the right strategies, you can improve your comprehension skills. Here are some tips to help you enhance your understanding of complex sentences:

1. **Develop a strong foundation in grammar:**
- Understanding the basic grammatical structures such as subject-verb agreement, verb tenses, and sentence types (e.g., declarative, interrogative, conditional) is crucial.
- Reviewing grammar rules and practicing sentence analysis exercises can help you become more comfortable with identifying different parts of a sentence.

2. **Identify and analyze sentence components:**
- Break down complex sentences into smaller parts to understand their structure and meaning.
- Identify the subject, verb, object, and any modifiers or phrases within the sentence.
- Pay attention to the relationships between clauses and phrases, such as cause and effect, condition, comparison, or concession.

3. **Focus on signal words and connectors:**
- Signal words and connectors can provide valuable clues to the structure and meaning of complex sentences.
- Look out for words like "because," "although," "however," "despite," etc., which indicate relationships between different parts of the sentence.
- Practice recognizing and understanding the different functions of these signal words.

4. **Read extensively and diversify your sources:**
- Reading a wide range of texts, including newspapers, magazines, academic articles, and fiction, exposes you to various sentence structures.
- Pay attention to the way complex sentences are used in different contexts and for different purposes.

5. **Use context clues and inference skills:**
- Sometimes, the meaning of a complex sentence may not be immediately clear. In such cases, use context clues from the surrounding sentences to infer the meaning.
- Look for synonyms, antonyms, or explanations that can help you understand unfamiliar vocabulary or complex ideas.

6. **Practice with sample questions and passages:**
- Regularly practice reading comprehension exercises that include complex sentence structures.
- Analyze the sentences, answer the questions, and review the explanations to improve your understanding and identify areas for improvement.

7. **Seek feedback and guidance:**
- Work with a tutor, join a study group, or seek feedback from a teacher or fellow student to help you identify and rectify any weaknesses in your understanding of complex sentence structures.
- Discuss challenging sentences and ask for explanations or alternative interpretations to broaden your perspective.

Remember that improving your understanding of complex sentence structures takes time and practice. Be patient, dedicate regular time to reading and analyzing texts, and actively apply the strategies mentioned above. By doing so, you will gradually enhance your comprehension skills and perform better in the Reading section of the IELTS exam.