Complex sentence: During 1984 the band took a break as members pursued other interests, upon reconvening infighting during rehearsals between Hay and Speiser over songwriting and the band's management led to a split in the band.
Split into simpler sentences: During 1984 the band took a break as members pursued other interests. Upon reconvening later that year, infighting during rehearsals between Hay and Speiser over songwriting and the band's management led to a split in the band.