Because the number of foreign students has been increasing,
Due to the fact that the sum of global students has been rising.
1 ）Because the number of foreign students has been increasing,
Points
1 the number of 〜 「〜の数」
〜の数が増えているという時は前に，the number of という言葉つけなければいけません。
Ex
The number of inbound visitors has been expanding for 3 consecutive years.
「日本への外国人観光客は3年連続で増えている」
2）Due to the fact that the sum of global students has been rising.
Points:
1Due to the fact that 〜 「なぜなら〜なので」
Because よりもフォーマルな言い回しです。
Ex
Sales of this firm has been increasing, due to the fact that global economy looks very well.
The number of foreign students has increased, so I want to teach them properly.
There has been an increase in the number of foreign students so I want to teach them well.
外国人 - foreigners, people from another country, people from abroad
もし外国人と話したら”foreigner”を言ったら嫌になるかもしれないから”people from other countries”の方がいいと思います。
The number of students from other countries
The number of non Japanese students
増える - increse, grown
人数が増えた - number of people have increase
生徒は増えた - more students, number of students has increased
伝えたい - want to teach, want to tell
お母さんに伝えたい - want to tell my mother
きちんと伝えたい - teach well, teach clearly, teach properly
日本 
イギリス 
