Complex sentence: He agreed, and in 1986 Brolin enrolled at Fotbollsgymnasiet, the football academy in Sundsvall, and was subsequently signed by GIF Sundsvall, making his first team debut in 1987 against IF Elfsborg.
Split into simpler sentences: He agreed, and in 1986 Brolin enrolled at Fotbollsgymnasiet, the football academy in Sundsvall. He was subsequently signed by GIF Sundsvall, making his first team debut in 1987 against IF Elfsborg.