Complex sentence: The bus routes 521,522 and 523 operate to the market and are subsidised by the company which own the market which pick up passengers from nearby places in Essex, such as Loughton, Debden, Waltham Abbey, Harlow, Brentwood and Ongar on Saturdays only.
Split into simpler sentences: The bus routes 521,522 and 523 operate to the market and are subsidised by the company which owns the market. The routes pick up passengers from nearby places in Essex, such as Loughton, Debden, Waltham Abbey, Harlow, Brentwood and Ongar on Saturdays only.