Question

the birds arrive at their winter abode inside the bird sanctuary (make it complex sentence )

Answer 1

The birds arrive at their winter abode inside the bird sanctuary, because they love to build houses in winter to get protected.

When it comes to complex sentences, they are the sentences which combine one independent clause with minimum one dependent clause.  

The clauses are group of words which have both a verb and even a subject.

On the other hand, independent clause actually forms a full thought.

Answer 2

Answer:

The birds arrive at their winter abode inside the bird sanctuary. (Add a question