Original sentence: With an emphasis on Sumerian forms, Deimel ("ŠL", 1922) lists 870 signs used in the Early Dynastic IIIa  period (26th century), Falkenstein (1936) lists 939 signs used in the earliest period (late Uruk, 34th to 31st centuries), Rosengarten (1967) lists 468 signs used in Sumerian (pre-Sargonian) Lagash and Mittermayer ("aBZL", 2006) list 480 Sumerian forms, written in Isin-Larsa and Old Babylonian times
Edited sentence: Falkenstein (1936) lists 939 signs used in the earliest period (late Uruk, 34th to 31st centuries).Lagash and Mittermayer ("aBZL", 2006) list 480 Sumerian forms, written in Isin-Larsa and Old Babylonian times.Rosengarten (1967) lists 468 signs used in Sumerian (pre-Sargonian).With an emphasis on Sumerian forms, Deimel  lists 870 signs used in the Early Dynastic II period (LAK, 1922) and for the Early Dynastic IIIa  period (26th century, "ŠL", 1922)