Complex sentence: Climbing back up to the 1st division proved to be a tough task and wasn't accomplished until spring 1997, with the game winning goal of the deciding game against Kiekko-67 being scored by Kari Teräväinen in overtime.
Split into simpler sentences: Climbing back up to the 1st division proved to be a tough task and wasn't accomplished until spring of 1997. With the game winning goal of the deciding game against Kiekko-67 being scored by Kari Teräväinen in overtime.