Complex sentence: Talladega is the longest NASCAR oval with a length of tri-oval like Daytona International Speedway, which also is a tri-oval, and the track at its peak had a seating capacity of 175,000 spectators, although the current capacity is 80,000 seats.
Split into simpler sentences: Talladega is the longest NASCAR oval with a length of tri-oval like the Daytona International Speedway, which also is a tri-oval. At its peak had a seating capacity of 175,000 spectators, although the current capacity is 80,000 seats.