Complex sentence: Sundström also made his Davis Cup debut against New Zealand in the quarter finals played at Eastbourne on grass and he lost both of his matches, but Sweden still managed to win the tie and make the final that year against Australia.
Split into simpler sentences: Sundström also made his Davis Cup debut against New Zealand in the quarter finals played at Eastbourne on grass. He lost both of his matches, but Sweden still managed to win the tie and make the final that year against Australia.