directions: rewrite the 2 sentences as 1 sentence by combining the main verbs and helping verbs...The carriage has crossed the bridge. The carriage has arrived at the mansion.

The carriage has crossed the bridge and arrived at the mansion. The carriage crossed the bridge and has arrived at the mansion. ???

I think the first is better, since it preserves the tense in both clauses.

The carriage has crossed the bridge and arrived at the mansion.