The road lead to success is not only zigzag and uneven, but also full of thorns and traps.
Is the sentence unintelligible?
Originally Posted by NewHope
The road to success not only zigzags and is uneven, but it is also full of thorns and traps.
Keeping as close to your original words as possible.
I'm not a teacher, but I write for a living. Please don't ask me about 2nd conditionals, but I'm a safe bet for what reads well in (American) English.