Yes, you need a comma, but you don't need then. And locate (relocate?) is not a good verb.
The sentence could be punctuated: "Once we rent the apartment, we can start considering a house and decide where we'd like to live."
You could also rewrite the sentence with the phrases at the end: "We can start considering a house and its location once we rent the apartment."
(after we rent is also better in this form)
The sentence "When Sarah reached her apartment she fell asleep almost at once" is a complex sentence. It contains an independent clause ("she fell asleep almost at once") and a dependent clause ("When Sarah reached her apartment"). The dependent clause establishes a condition or time frame for the action in the independent clause.
"Considering" can act as a preposition or a conjunction, depending on its usage in a sentence. As a preposition, it introduces a clause or phrase showing a factor relevant to the main clause. As a conjunction, it connects two ideas and shows a relationship between them.
A complex sentence is a sentence that contains an independent clause and at least one dependent clause. The independent clause can stand alone as a complete sentence, while the dependent clause relies on the independent clause to make sense.
It have 2 clauses in Complex sentence. It is Dependent clause and Independent clause
A sentence with an adverb or adjective clause is a complex sentence, because an adjective clause is a subordinate clause. A complex sentence must contain one independent clause plus one or more subordinate clauses.
A sentence with an adverb or adjective clause is a complex sentence, because an adjective clause is a subordinate clause. A complex sentence must contain one independent clause plus one or more subordinate clauses.
The main clause or the principal clause in a complex sentence; is a key sentence.
That would be a complex sentence.
A clause can not stand alone in a sentence, whereas an independent clause can stand alone in a sentence.
A complex sentence is a sentence consisting of an independent clause and a subordinating clause.
A complex sentence is a sentence that contains an independent clause and one or more dependent clauses. The independent clause can stand alone as a complete sentence, while the dependent clause(s) rely on the independent clause for meaning.
You make a complex sentence when you have both a dependent clause along with an independent clause.