Complex sentence: The 1990 PBA Third Conference Finals is the best-of-5 championship series of the 1990 PBA Third Conference, and the conclusion of the conference's playoffs, the Purefoods Hotdogs and Alaska Milk are both gunning for their first PBA crown.
Split into simpler sentences: The 1990 PBA Third Conference Finals was the best-of-5 championship series of the 1990 PBA Third Conference, and the conclusion of the conference's playoffs. The Purefoods Hotdogs and Alaska Milk are both gunning for their first PBA crown.