Complex sentence: He said he had taken Tin Pei Ling in when Prime Minister Lee Hsien Loong had offered to field her in his GRC as he did not think Tin Pei Ling was a weak candidate.
Split into simpler sentences: He said he had taken Tin Pei Ling in when Prime Minister Lee Hsien Loong had offered her to be fielded as a candidate in his GRC. He had accepted her as he did not think Tin Pei Ling was a weak candidate.