It's not a omplete sentence. It's a subordinate clause. Compare this.
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JimmyHTrue but I dont want to make it obvious by saying that I felt happy while exploringIn that case, please add an idea to make it a complete sentence.
JimmyH I went out to explore the city and got to witness these amazing sights.No. As shown as above.
JimmyHExcept for I is everything else correct?Full stop at the end has been added as well.