Complex sentence: Others are allowed by the cheesemaker to develop bacterial surface growths which give characteristic colours and appearances, e.g. by the growth of Brevibacterium linens which gives an orange coat to cheeses.
Split into simpler sentences: Others are allowed by the cheesemaker to develop bacterial surface growths which give characteristic colours and appearances. The growth of Brevibacterium linens, for example, creates an orange coat to cheeses.