Complex sentence: Part of Westerfield's defense focused on the lifestyle of Danielle van Dam's parents, whom they argued had an open marriage, were "swingers," and smoked marijuana in their garage regularly.
Split into simpler sentences: Part of Westerfield's defense focused on the lifestyle of Danielle van Dam's parents. The defense suggested that the couple were known to have an open marriage, were "swingers," and smoked marijuana in their garage regularly.