Grammatical range
To perform well in grammatical range, which takes up 25% of the overall IELTS writing score, one must use a wide range of sentence structures and not make any punctuation or grammar mistakes.
Clauses
To learn more about dependant vs independent clauses is, have a look at this article first.
Sentence structures and required punctuation
Note that the following sentence structures have even more categories within them that can be used to obtain a high score for grammatical range.