Complex sentence: Aunt Bam also tells Ruth that the woman who lived in her house before her (Helen) died in the house, she has been dead for 3 weeks until Aunt Bam notice that she smells a weird odor from her house.
Split into simpler sentences: Aunt Bam also tells Ruth that the woman who lived in her house before her (Helen) died in the house. She has been died for 3 weeks until Aunt Bam notice that she smells a weird odor from her house.