Complex sentence: Adopting the role of honourary secretary and treasurer, most of the other early members of SPAB were his friends, while the group's program was rooted in Ruskin's "The Seven Lamps of Architecture" (1849).
Split into simpler sentences: Adopting the role of honourary secretary and treasurer, most of the other early members of SPAB were his friends. The group's program was rooted in Ruskin's "The Seven Lamps of Architecture" (1849).