How To Use When first seen In A Sentence

• When first seen, it wore the aspect of a nebula; later it put on the distinctive garb of a comet; it next appeared as a star; finally, it dilated, first in a spherical, then in a paraboloidal form, until May 5, A Popular History of Astronomy During the Nineteenth Century Fourth Edition
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• Seven children were receiving anticonvulsants when first seen; all were being given phenobarbitone and two children were receiving one and one child two additional drugs.
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