TASK DEFINITION: In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
PROBLEM: The Open Database License ( ODbL ) is a copyright license for sharing database contents .

SOLUTION: The Open Database License ( ODbL ) is a copyleft ( " share alike " ) license agreement intended to allow users to freely share , modify , and use a database while maintaining this same freedom for others .

PROBLEM: The organism changes from a single zygote to a complex system of tissues and cell types .

SOLUTION: Differentiation occurs numerous times during the development of a multicellular organism as it changes from a simple zygote to a complex system of tissues and cell types .

PROBLEM: A Digital Object Identifier ( or DOI ) is a permanent way to identify an online document .

SOLUTION:
In computing , a digital object identifier ( DOI ) is a persistent identifier or handle used to identify objects uniquely , standardized by the International Organization for Standardization ( ISO ) .