Question

I was the first to arrive(Change into complex sentence)

Answer 1

Structurally, sentences are of four types:

Simple sentence
Compound sentence
Complex sentence, and 
Compound-complex sentence.

Complex sentence

A complex sentence also has more than one clause but of one them must be an independent clause and the other/others must be (a) dependent clause(es). There are also some particular connectors for the clauses of a complex sentence to be connected.

ANSWER:

I WAS THE ONE WHO ARRIVED FIRST.

Answer 2

Answer:

I WAS THE ONE WHO ARRIVED FIRST

hope it helps :)