वाक्य को पढ़ें: 'The young Louis Braille quickly realized how useful this system of raised dots could be, provided it was simplified.' वाक्य में रेखांकित भाग किस प्रकार का उपवाक्य (clause) है?

Identify the type of subordinate clause in the following sentence: 'He was an engineer who worked in some distant projects.'

Identify the type of the underlined clause in the given sentence: We often think that all signs point to progress.