Complex sentence: This doesn't sit well with Lela, who throws the necklace into the ocean, prompting Mack and Brady to search for it; this leads to another argument between them, which disturbs Lela and Tanner.
Split into simpler sentences: This doesn't sit well with Lela, who throws the necklace into the ocean, prompting Mack and Brady to search for it. This leads to another argument between them, which disturbs Lela and Tanner.