Complex sentence: Senate House has been criticised for the low quality of much of the material it produces for the teaching of the English Language, which is often written by non native speakers of English, is riddled with errors and bares little or no cultural benefit for students.
Split into simpler sentences: Senate House has been criticised for the low quality of much of the material it produces for the teaching of the English Language. Much of the material produced is written by non native speakers of English, is riddled with errors and bares little or no cultural benefit for students.