Can I write something like: among people from that country and among people from not I know it can be easily rewritten as: among people that are from the country and among people that are ...
I am wondering whether to use a restrictive relative clause such as: "Multicopters belong to a family of aircraft called rotorcraft , which also includes helicopters, and although they appear to be ...
E.g. are these correct? Following the rules, even if it's difficult, is essential. Following the rules, although it's difficult, is essential.