Complex sentence: Upon disclosing what happened at the talto in regards to Clary, Jace becomes extremely concerned as while he lets Clary be a shadowhunter, he still is protective of her and worries about her as he loves her and she is not as experienced.
Split into simpler sentences: Upon disclosing what happened at Talto in regards to Clary, Jace becomes extremely concerned. While he lets Clary be a shadowhunter, he still is protective of her and worries about her as he loves her, and she is not as experienced.