Complex sentence: More detailed profiling is done prior to the dimensional modelling process in order to see what it will require to convert data into the dimensional model, and extends into the ETL system design process to establish what data to extract and which filters to apply.
Split into simpler sentences: More detailed profiling is done prior to the dimensional modelling process in order to see what is required to convert data into the dimensional model. Detailed profiling extends into the ETL system design process in order to determine what data to extract and which filters to apply.