Complex sentence: Some restaurants are bothered by Killer Rezzy selling reservations to their restaurant when free reservations can be made at OpenTable, however, restaurants who choose to partner with Killer Rezzy can expect to a share of the revenue generated by the sale of reservation.
Split into simpler sentences: Some restaurants are bothered by Killer Rezzy selling reservations to their restaurant when free reservations can be made at OpenTable. Restaurants who choose to partner with Killer Rezzy can expect to a share of the revenue generated by the sale of reservation.