"constituted an important part" is a grammatically correct phrase and can be used in written English.
It is typically used to describe something that is a crucial or essential element or component of something else. Example: The music industry constituted an important part of the city's economy, providing jobs and generating millions in revenue.
Somerville was unusual as a successful female author in the sciences, but she was not unique and among readers women constituted an important part of the market.
The epic is rich in information about sacred places, and it is clear that making pilgrimages and bathing in sacred rivers constituted an important part of religious life.
Royal nominations to bishoprics and abbeys agreed to by representatives of the respective diocese had constituted an important part of royal authority at the time, and Gregory's insistence on the elimination of secular influence threatened the very existence of the kingdoms.
The 'Finger Plan' has constituted an important part of the planning framework, albeit informally.
Cell-sheet technology has already constituted an important part in the regenerative medicine.
They revealed that cognitive behavioral therapy, physical therapy and exercise, and other approaches (massage) were promising therapies for relieving pain and constituted an important part of the treatment as well as of the multidimensional approach to pain management.
An appropriate treatment of uncertainties constitutes an important part of the risk assessment process.
School broadcasting constitutes an important part of the service.
They constitute an important part of the diet of the European herring.
In many cases, these forms of governance continue and constitute an important part of the political lives of indigenous peoples.
In humans, fat constitutes an important part of the diet, and in some countries it can contribute as much as 45 percent of energy intake.
