Complex sentence: The UTA numbering sequence continued from earlier building, the powered cars were numbered from 8 to 35 inclusive (28 units), the non-powered cars, commencing a new series, from 501 to 527 inclusive.
Split into simpler sentences: The UTA numbering sequence continued from earlier building, the powered cars being numbered from 8 to 35 inclusive (28 units). The non-powered cars commenced a new numbering series, from 501 to 527 inclusive.