GitScc.DataServices.RepositoryGraph.GetSimplifiedCommits C# (CSharp) Method

        private IEnumerable<Commit> GetSimplifiedCommits()
        {
            foreach (var commit in Commits)
            {
                if (commit.ParentIds.Count() == 1 && commit.ChildIds.Count() == 1 && !this.Refs.Any(r=>r.Id==commit.Id))
                {
                    var cid = commit.ChildIds[0];
                    var pid = commit.ParentIds[0];

                    var parent = Commits.Where(c => c.Id == pid).FirstOrDefault();
                    var child = Commits.Where(c => c.Id == cid).FirstOrDefault();

                    if (parent != null && child != null)
                    {
                        int x1 = GetLane(parent.Id);
                        int x2 = GetLane(commit.Id);
                        int x3 = GetLane(child.Id);

                        if (x1 == x2 && x2 == x3)
                        {
                            commit.deleted = true;
                            parent.ChildIds[parent.ChildIds.IndexOf(commit.Id)] = cid;
                            child.ParentIds[child.ParentIds.IndexOf(commit.Id)] = pid;
                        }
                        //commit.ChildIds.Clear();
                        //commit.ParentIds.Clear();
                    }
                }
            }

            return commits.Where(c => !c.deleted);
        }