Use nominalisations

Compare these two sentences:

The government banned smoking in public places in 2007. Since then, fewer people have been admitted to hospital for smoking-related diseases.

The ban on smoking in public places in 2007 has led to a fall in hospital admissions for smoking-related diseases.

The second sentence contains two nominalisations (in bold). A nominalisation is a noun phrase derived from another word class, usually a verb. In the sentence above, 'the ban on smoking in public places in 2007' is a nominalisation of the verb phrase 'banned smoking in public places in 2007'; 'a fall in hospital admissions for smoking-related diseases' is a nominalisation of 'fewer people have been admitted to hospital for smoking-related diseases'.

Nominalisations are useful in academic writing because they convey an objective, impersonal tone.  Nominalisations can also make the text more concise because they can pack a great deal of information in a few words.