https://techipe.info/english-grammar-guide-simple-compound-complex-%e0%a6%b6%e0%a6%bf%e0%a6%96%e0%a7%87-%e0%a6%a8%e0%a6%bf%e0%a6%a8-%e0%a6%8f%e0%a6%87-%e0%a6%aa%e0%a7%8b%e0%a6%b8%e0%a7%8d%e0%a6%9f%e0%a7%87/