Complex sentence: The Esmond (43/8a), Forbes (43/13a) and Gordon (43/20a) fields reservoir is in the Lower Triassic Bunter Sandstone and was discovered by well 43/13-1 in 1969 by Hamilton Brothers Oil and Gas.
Split into simpler sentences: The Esmond (43/8a), Forbes (43/13a) and Gordon (43/20a) fields. The reservoir for these fields was in the Lower Triassic Bunter Sandstone and was discovered by well 43/13-1 in 1969 by Hamilton Brothers Oil and Gas.