Complex sentence: Under the partnership, Ram gave Lambert a customized 1500 Laramie Longhorn which she auctioned off, with proceeds going to Lambert's Muttnation Foundation which betters the lives for shelter animals.
Split into simpler sentences: Under the partnership, Ram gave Lambert a customized 1500 Laramie Longhorn which she is auctioning off. Proceeds of the auction will go towards Lambert's Muttnation Foundation which betters the lives for shelter animals.