Complex sentence: During the early years Leclanché designed, developed and manufactured dry cells (primary batteries) and lighting equipment, and already from the beginning-1920's diversified into capacitors, and later, rechargeable batteries (secondary batteries) and associated systems.
Split into simpler sentences: During the early years Leclanché designed, developed and manufactured dry cells (primary batteries) and lighting equipment. From the 1920s, it diversified its production to include into capacitors, followed later by rechargeable batteries (secondary batteries) and associated systems.