Complex sentence: JIRA has a plugin architecture and a large number of integrations developed by the JIRA development community and third-parties, including IDE's like Eclipse and IntelliJ IDEA using the Atlassian IDE Connector.
Split into simpler sentences: JIRA has a plugin architecture and a large number of integrations developed by the JIRA development community and third-parties. JIRA integrates with IDE's like Eclipse and IntelliJ IDEA using the Atlassian IDE Connector.