Complex sentence: A typical electronic kanban system will see inventory marked with barcodes which are scanned at various stages of the manufacturing process to signal usage, messages are then relayed to internal/external stores to ensure restocking of products.
Split into simpler sentences: A typical electronic kanban system marks inventory with barcodes, which workers scan at various stages of the manufacturing process to signal usage. The scans relay messages to internal/external stores to ensure restocking of products.