Types of Sentences

https://www.engvid.com/the-4-english-sentence-types-simple-compound-complex-compound-complex/

https://www.youtube.com/watch?v=hWmKnrtlTHU

Dependent Clauses

https://www.engvid.com/advanced-english-grammar-dependent-clauses/

Types Of Dependent Clauses (3)

Noun Clauses

https://www.engvid.com/advanced-english-grammar-noun-clauses/

Adjective Clauses

https://www.engvid.com/learn-english-grammar-the-adjective-clause-relative-clause/

Adverb Clauses

https://www.engvid.com/learn-english-grammar-the-adverb-clause/

Complex Sentences

https://www.grammar-monster.com/glossary/complex_sentence.htm

Exercises

https://www.thoughtco.com/complex-sentence-worksheet-1210448

https://elt.oup.com/student/solutions/advanced/grammar/grammar_10_022e?cc=co&selLanguage=en

https://www.englishgrammar.org/compound-complex-sentence-exercise/

https://www.englishpractice.com/improve/formation-complex-sentences-exercise/