Question

while japan has an excellent network of traditional road, rail, air, and sea travel, the country also boasts the exceptionally fast and safe shinkansen system of bullet trains.
simple
compound
complex
compound-complex

Explanation:

A complex sentence has one independent clause and at least one dependent clause. The sentence "While Japan has an excellent network of traditional road, rail, air, and sea travel, the country also boasts the exceptionally fast and safe Shinkansen system of bullet trains" has a dependent clause ("While Japan has an excellent network of traditional road, rail, air, and sea travel") introduced by "while" and an independent clause ("the country also boasts the exceptionally fast and safe Shinkansen system of bullet trains"). A simple sentence has one independent clause, a compound has two independent clauses, and compound - complex has multiple independent and dependent clauses. So this is a complex sentence.

Answer:

complex