Complex sentence: As this decade drew to a close, La Sonora Matancera decided on a course of action that would become standard practice: the incorporation of non-Cuban lead singers into its ranks without, however, the exclusion of Cuban artists.
Split into simpler sentences: As this decade drew to a close, La Sonora Matancera decided on a course of action that would become standard practice for the group. This was in essence a simple measure: the incorporation of non-Cuban lead singers into its ranks without, however, the exclusion of Cuban artists.