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One of the weaknesses of wireless sensors networks (WSN) is the limit of energy which affects networkpsilas lifetime. To increase the lifetime of the sensor network, this paper suggests a new routing approach which combines two algorithms: LEACH and PEGASIS. In our proposal, nodes belonging to the same cluster form a chain where nodes communicate only with their closest neighbors, so that energy dissipation within clusters can be minimized and consequently, lifetime of the network can be improved. Simulations using Network Simulator ns2 have been conducted to study the behavior of our routing algorithm. Its performances are evaluated and compared to those of different existing algorithms (LEACH, LEACH-C, and PEGASIS).