This is the 19th most frequent Russian word.
более
"Более" means "more" or "over" in English.
Here, 'более' is used to indicate a comparative degree and is followed by 'интересная' to describe the relative characteristic of the noun.
Эта книга более интересная, чем та.
This book is more interesting than that one.
In this sentence, 'более' modifies the adverb 'эффективно' to express a higher degree of the action.
Он старается работать более эффективно.
He tries to work more efficiently.
Here, 'более' is used to enhance the descriptive adjective 'сложное', emphasizing the requirement level for the equipment.