How to make group by Revision_ID and when repeated display l

Question

problem

How to make group by Revision_ID and when repeated display last check date separated by stick | ?

I need to group data by Revision_ID that make count to all zpartid

every revision_ID Have group of parts .

and when revision id repeated two time then lastcheckdate is firstdate | seconddate

and if more than two time then display text multi date

so How to do that please ?

CREATE TABLE [Parts].[LifeCycleMaster](
    [LifeCycleID] [bigint] IDENTITY(1,1) NOT FOR REPLICATION NOT NULL,
    [ZPartID] [bigint] NOT NULL,
    [LastCheckDate] [date] NULL,
    [Revision_ID] [bigint] NULL,
 CONSTRAINT [PK_LifeCycleMaster_LifeCycleID] PRIMARY KEY CLUSTERED
(
    [LifeCycleID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY],
 CONSTRAINT [UK_PartID] UNIQUE NONCLUSTERED
(
    [ZPartID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
Revision_ID ZPartID LastCheckDate
12            10        12/12/2015
15            120       12/01/2014
15            130       05/05/2016
20            170       09/03/2013
20            200       09/05/2016
20            300       09/08/2017

    FinalResult
Revision_ID  CountParts LastCheckDate
12         1    12/12/2015
15         2    05/05/2016 |12/01/2014
20         3    Multi date