Complex sentence: His preference then became the style for many important buildings constructed during his tenure at the PWD and FMS Railways, many of them designed by Arthur Benison Hubback, and these buildings have since become an important part of the architectural heritage of Malaysia.
Split into simpler sentences: His preference then became the style for many important buildings constructed during his tenure at the PWD and FMS Railways, many of them designed by Arthur Benison Hubback. These buildings have since become an important part of the architectural heritage of Malaysia.