Complex sentence: Adelaide finished fifth out of seven teams in each of the next two seasons, and last in 1880, forcing the team to merge with Kensington for the 1881 season due to a lack of players.
Split into simpler sentences: Adelaide finished fifth out of seven teams in each of the next two seasons, and last in 1880. The teams poor performances forced the club to merge with Kensington for the 1881 season due to a lack of players.