Complex sentence: At its height from the Victorian to pre-WW2 eras, theatres provided a dynamic programme of entertainment to the communities they served typically, boasting "two shows nightly" with weekend matinees.
Split into simpler sentences: At its height from the Victorian to pre-WW2 eras, theatres provided a dynamic programme of entertainment to the communities they served. Typically, they boasted "two shows nightly" with weekend matinees.