The answer of the given sentence using relative clause is- Pita was surprised by her sister Juanita, who _went to visit her after three years .
What is a relative clause ?
A clause that modifies a noun or noun phrase is referred to as a relative clause if it makes use of a grammatical technique to show that one of the arguments in the sentence refers to the noun or noun phrase.
For example, in the sentence -The unicorn possessed magical powers which could heal the sick, the subordinate clause "which could heal the sick" is a relative clause since it modifies the noun "unicorn" and uses the pronoun which to indicate that the same "unicorn" is referred to in the subordinate clause (in this case as its subject).
In the given sentence, Pita was surprised by her sister Juanita, who _went to visit her after three years ,the subordinate clause "went to visit her after three years" is a relative clause since it modifies the subject "Juanita" and uses the pronoun who to indicate that the same "Juanita" is referred to in the subordinate clause.
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