Complex sentence: Rodgers's music was written using modular forms, was tonal or modal in character, featuring ostinati, and were often written in scores with open or flexible instrumentation and can be considered one of the earliest composers in a post-minimal style.
Split into simpler sentences: Rodgers's music was written using modular forms, was tonal or modal in character, featuring ostinati, and were often written in scores with open or flexible instrumentation. He can be considered one of the earliest composers working in a post-minimal style.