Complex sentence: He returned to land drag racing in 1985 in the Top Fuel division in a team that was initially underfunded and unsuccessful, but it became more competitive and successful by the end of the 1986 season.
Split into simpler sentences: He returned to land drag racing in 1985 in the Top Fuel division. The team was initially underfunded and unsuccessful, but it became more competitive and successful by the end of the 1986 season.