Explain the complex sentence given below.
Input: Although his family had given up hope, he held on tightly.
The sentence means that despite their pessimism, he persevered in believing in a positive outcome.
This sentence is a complex sentence because it contains a coordinating conjunction (although) and a subordinating conjunction (hold on tightly) in the main clause. It also contains an independent clause (he held on tightly) that provides further explanation for the main clause.